In order to make an informed decision about what size of pool heater you need for a given application, you need to know the following: 1) The volume of the pool The volume of a straight-walled pool can be loosely calculated using this formula (in feet): average length x average width x average depth x 7.5 = volume in gallons Existing heater cost about 3k. For size at 6 BTUs per gallon or 1.5 BTUs per liter of water; to heat in the normal spring and fall conditions when the ambient air temperatures have an average of less than 60F in a 24-hour period. How will that affect heater performance? Roughly the same amount of gas will be consumed either way, so dont assume that the larger one will cost more to operate. Live in SC & have inground pool, 34 by 15. Related: Pool volume calculator Step 2: Divide the Pool's Surface Area by 3 For example, if your pool is 15 x 30, then your surface area is 450 square feet. upon looking at my gas meter it only has 3/4 inch piping and the chart says that I should have at least one and a quarter inch all the way to the heater. (F) Heat-up time (hours) (0 minimum suggested) ft. surface area512 3 = 170.7170.7 x 1,000 = 170,700 BTU Minimum. Product Description The Universal H-Series is an energy efficient, high performance, installation adaptable commitment to the pool service professional. As a heater ages, the efficiency goes down, and a lack of regular service can make the efficiency decrease even faster. Most pool owners consider 75 - 85 degrees Fahrenheit to be adequately comfortable. There is some truth to it, as bigger heaters will heat a pool more quickly, and it can offer a greater temperature differential than a smaller heater would. For example, if you're looking at a 200,000 BTU heater with an efficiency of 85%, you could expect an actual heat output of 170,000 BTU. linking up multiple cells - lowering installation costs from a smaller If you havent ever been a part of this process before, or not much of a DIYer, then you might be asking, What makes the process of figuring out what pool heater you need so difficult? Well, as it is with much of what goes into building your backyard paradise, each detail, measurement, and decision matters! Rules For Sizing Your Heat Pump Pool Heater Size at 4 BTU's per gallon or 1 BTU per litre of water. I need to boost the heat only to extend the swimming season and rise Temp to 85 from April, May, June and November . Then plug those measurements into the equation below:(Width A + Width B) x Length x 0.45. Pumps, Learn About The Universal H-Series 400,000 BTU Propane Gas Pool & Spa Heater from Hayward provides reliable, long-lasting comfort for pools and spas with a surface area up to 1,200 ft. Maintenance, Product Depending on the size you choose, this pool heat delivers an output of 150,000 to 400,000 BTUs per hour. All rights reserved. $4,099.00. It can raise the temperature of an 800 gallon pool 30 degrees in less than an hour you'll feel the benefits the moment you step into the water. *Please use the recommended heating times They are as realistic calculations based on 1 degree of temperature change per hour. We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. Thanks, I have a 3620 pool in NY surrounded by trees and shade. To calculate your pools surface area, choose from these options: Manufacturers will provide a chart to help you determine the right size heater for your swimming pool. email address for response re: 34 by 15 foot pool in SC is bjsimons50@yahoo.com. ET Click OK to extend your time for an additional 0 minutes. 3 Beds. What size would be the most efficient to run? Pool and spa combos may require a more substantial heater, depending on the volume of the hot tub itself and the desired heat-up time. As a result, the heater must be large enough to compensate for the surface area and pool size. Lighting, Learn About This is because youll need to capture more heat from the environment than in the summer. Hi there- I have a 1228 pool (no spa) and its 6FT deep in deep in and 3FT in shallow. After you have calculated the volume of your pool and derived the gallons of water required, it is very easy to find out the ideal BTUs required. Using a solar pool cover in conjunction with a gas pool heater or heat pump greatly reduces evaporation and insulates your pool surface against heat loss. }, Therefore, the minimum size heater that is recommended for a 15 x 30 pool is 150,000 BTUs. I am going to presume Coast Boca implies you are in southern Florida. For a 15 x 30 pool without a solar cover, I might recommend the 250 k or 300 k BTU model, depending on the customers preferences. PRO TIP: When figuring out how many BTUs you need, it's important to also figure in the heater's efficiency. What many believe in is bigger the pool heater, the better performance it would deliver. I have a 18 x 33 ft above ground pool that I use for exercise. more, View Address: IMG 8175 W. Buckeye Rd.Phoenix AZ 85043 USA, Pool & Drain Cover Safety Feel free to leave us a message and we will be in touch as soon as an agent is available. Can you Swim with Contacts in the Ocean/Pool? There's one more thing to keep in mind before completing your pool heater purchase. any heater in an existing pad with the efficient reliability of the new Universal HC Series dual-fuel technology gas heater from Hayward. But most of the electric pool heaters require a three-phase power source, another rarity in residential installations. "primaryImageOfPage": { if your pools usees traditional chlorine the RP2100 with Copper Heat Exchanger is your best choice. Built with a durable cupro nickel heat exchanger, it offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry, ensuring you . The size of your pool as well as the usage plays a pivotal role in arriving at the right pool heater with just the right BTU. pool or spa application. If you dont use a solar cover, live in a windy area, the pool is mostly shaded, or you're looking for a larger temperature differential during the spring and fall months, youll want to look for a larger heater that can meet or exceed your expectations. If you plan to operate the pool late-Spring to the end of Summer, Id choose the heat pump; itll make the water comfortable on those borderline-weather weekends. Thats when having a higher BTU size comes in handy. Your email address will not be published. ft. surface area 512 sq. I do not see the area of the country you live in, the seasons youll be operating the unit or the cost of utilities. What temps are you wanting the watert to reach? Your choice of heater will be limited by the size of the available gas line a larger pipe size is necessary for larger heaters with a higher BTU output. And lastly, if you have an above ground pool, read my guide on how to heat an above ground swimming pool. For this example well use 73F. }, For size at 5 BTUs per gallon or 1.3 1.5 BTUs per liter of water; to heat in the normal spring and fall conditions when the ambient air temperatures average 60F in a 24-hour period. Not all pools are the same shape or size, so youll have to measure the surface area of the pool. Once you determine your pools surface area, divide it by three. Unfortunately, being a disabled widow, cost is a concern for me, so if any ideas of heater with that in mind. As an Amazon Associate, we earn from qualifying purchases. So youre tired of swimming in cold water and have decided you want a heater for your pool. Lets do this together. Im interested in trying a heat pump but have no idea how much BTU we would need. Use Pool Dimensions Use Pool Volume Pool Size Length FT IN Width FT IN Pool Depth Deep end FT IN Shallow end FT IN Heating Starting pool temp. Hayward designed the HeatPro series of pool heat pumps to be durable and quiet, especially in comparison with some gas pool heaters. This chart will show you the amount of BTUs in proportion to your pools surface area. "width": "1060", The next size up cost 7k. Our sales reps are real people offering great service backed by extensive training and product knowledge. Looking for pool parts? If you want your pool to retain the heat for long, try covering the pool with the right material. But Coates has a sizing calculator. This equation accounts for a 1F temperature increase per hour with 3.5 mph surface winds. If considering adding a heater, do not forget to consider the price of running the gas line to it. Home Swimming Pool Kit Articles What Size Pool Heater Is Right For Your Pool? Haywards LowNox heaters require a 1-1/4 gas line for a 50-100 foot run. I forgot to mention that my pool also has a sloped- dished-out deep end that is about 6 1/2 ft. Dont see an answer so I will as a poolman Id install a Starite 333 or 400. Keep in mind, this is simply the recommended minimum size. "url": "https://lesliespool.com/", Hayward Universal H-Series ASME gas heater is "caption": "How to Size a Pool Heater: How Many BTUs?" "thumbnailUrl": "https://blog.lesliespool.com/wp-content/uploads/2022/09/Blog-1060x500-how-to-size-a-pool-heater-btu.jpg", In order to be able to swim all summer (and end of spring plus beginning of fall would be wonderful!) "url": "https://lesliespool.com/blog/" Filters, Learn About If the pool is extensively used round the clock, a powerful heater is the only way out to keep the pool warm for most of the time. That way, it accounts for heat loss, evaporation, and unexpected windy conditions. Pumps, Learn About There are a lot of decisions pool owners make during the heater buying process. A larger gas meter and home pressure regulator will also be required. }, performance and versatility, in the 3" class from 2.0 HP through 7.0 HP. Two questions today: 1. Hi, Pools above the ground tend to lose heat to the environment faster than those in the ground as they have larger area exposed to the air outside. Ft. 318 Sequoia Ave, Brea, CA 92821. Can you Open your Eyes in the Ocean? "@type": "ImageObject", Pool Heaters Hayward's advanced line of heaters delivers the ultimate in comfort and energy efficiency while maintaining ideal pool & spa water temperature all season long. With the larger pool companies like Hayward or Pentair, you may call about a heater issue, but you are on the line that is more familiar with pumps or filters and can only go through basic troubleshoot handbook. MLS # MDBA2082050. Please remove additional products. "@type": "Person", Products, Learn About Sometimes, its cheaper to simply invest in a solar blanket than paying for a larger heater. This pool heater can raise the temperature of 1,000 gallon pools to 15 degrees Fahrenheit in just 36 minutes. Matthew You might settle on the 200K or 250k heater. Pool pH Calculator: How To Get Your pH Level In Range. Just send me an email; I'm glad to help. While sizing according to volume isn't wrong, most of a pools heat is lost through evaporation at the surface, so the best way to size a pool heater is to calculate the surface area in square feet. JavaScript is disabled. This minimum will typically accommodate a 2530F increase in temperature. Nearby homes similar to 561 Shadow Lake Dr #49 have recently sold between $180K to $260K at an average of $135 per square foot. A 400k BTU heater will roughly heat your pool twice as fast as a 200k BTU heater, but it also burns gas twice as fast. The pools surface area divided by three gives you the minimal BTU size recommended for that particular surface area. The ole bigger is better statement. as The installation cost also depends on whether you currently have electrical service around your pool or built your pool with an electric pool heater in mind. costs while delivering game-changing performance. What Size Pool Heater Is Right For Your Pool? Yes Im in same boat, no gas on my street its all electric coast Boca. Weve all heard the saying bigger is better. OmniPLoffers powerful pool and spa automation for mid-range builds and renovations. However, this isnt always the case for every pool setup, and it may not be feasible for some pool owners from a budget standpoint. Using a solar blanket in conjunction with your heater is the best tag team to provide the best heat in the shortest amount of time. For a better experience, please enable JavaScript in your browser before proceeding. It provides above-ground and most flat-bottomed, in-ground pools with superior coverage due to its extended battery life and 30% more debris pickup. We entertain frequently on week-end, and want maintain pool temp at 82F. Heating up a pool versus a pool/spa combination requires less BTU power. You may have heard the bigger is better rule of thumb about sizing pool heaters. provide a technologically advanced alternative to traditional Bronze or Founded in 1996, Pool Warehouse is proud to call East Tennessee Home. Important decision factors, including choosing between natural gas vs. propane, as well as determining which brand of heater has the best performance record, can have a big impact on your final choice. Are you going to do a traditional May to September, or do you want the option to go year-round? Most of the people are aware of the fact that higher the BTU output of the heater, faster will the pool be heated. This is simply the recommended minimum size. Generally speaking, the amount of BTUs required to heat pool water will be the same, no matter the size of the heater. Hayward W3HP21004T HeatPro 95,000 BTU Pool Heat Pump for In-Ground Pools 212 $3,999.00 Fibropool Swimming Pool Diverter Valve - 1 1/2 Inch Female Threaded - 3 Way - Replacement Valve for Pools and Spas 760 $18.49 Special offers and product promotions Sale: $3999 Discount Provided by Amazon. "contentUrl": "https://blog.lesliespool.com/wp-content/uploads/2022/09/Blog-1060x500-how-to-size-a-pool-heater-btu.jpg", Go To Energy Calculator SUMMIT XL HEAT PUMP The Most Efficient Way to Extend the Swim Season. The problem: the distance for the new gas line will be about 70-75 feet, and the gas supply is what is "natural gas low pressure". Most heat loss happens overnight. Learn More Sort By: View: Compare Select to Compare }, If you want to be more specific with your pool heater sizing calculations, multiply your pools surface area by the desired temperature differential, then multiply that number by 12. Pool temp is fine for 8+ months of the year. Water Features, View All Your information here is great, and it sounds like you really know your stuff So, I have a question on the same subject of pipe size/length and btus. Eventually, I realized that my bigger is better line wasnt always the best advice for every pool set up and sooner, rather than later, Id have to learn how to size a heater for a pool owner. West Chicago, IL 60185. Probably one of the toughest decisions to make when it comes to purchasing a pool heater is what size to go for. The power of the pool heaters is measured in BTUs. In order to make the best decision as far as a pool heater is concerned, there is some critical pool information, being well aware of which, can never go in vain. All-In-One Sanitization To heat the pool water to a certain temperature within the same period of time, youll need a bigger pool heat pump in the winter than in the same. If you prefer to look at averages vs. using this calculator, I wrote a guide on average pool heater costs by type that should help. When it comes to gas heaters, you always want to oversize the unit. View this $10000 3 bed, 2.0 bath, 0 sqft single family home located at 3819 Hayward Ave built in 1900 on Zillow. 1,655 Sq. Thank you for your business! "mainEntityOfPage": "https://lesliespool.com/blog/how-to-size-a-pool-heater-how-many-btus", If you have a pool with a large surface area, the heat has more space to escape and subsequently, more water to heat. To calculate the surface area of your pool, multiply the length times the width. Live in central Florida, no screen enclosure. Select to Compare Electric Spa Heater As an added bonus, warmth from the sun will be transferred into the water during the day. Important: This article is about sizing gas pool heaters, not electric heat pumps. Raypak Classic Series Heat Pump 140,000 BTU 016033. Heres How to Fix It. automatically implements chemical feeding in proportion to demand for Hayward's Universal H-Series heaters represent innovative heating technology for pools and spas. If you like swimming at night, a larger pool heater will help maintain a comfortable swimming temperature while the cover is off. with UV, Ozone and Hydroxyl Radicals. Always windy. We can help! 90 feet of 1 inch natural gas pipe to heater and reduced it at last 4 feet to 3/4 inch. The Series offers a variety of power and electrical options, which 1. So we upgraded the pipe, re-ran the line, etc. Lighting, Learn About These aspects should always be put into consideration to save on time and money on your end. For those swimming pools that are built into the ground, raising their temperatures and keeping them at a certain level is easier as the ground adds to the heat retention level of the water. Can a pool heater be up-sized? When the decision is regarding the right pool heater for your pool, you shouldnt take a blind call solely on the basis of how it looks, its reviews or how economically it is priced. The Hayward Universal H-Series Natural Gas Pool and Spa Heater brings you quiet, efficient heating for your pool and spa. Current pool heaters are 85% to 90% efficient. Understanding BTUs helps you determine the necessary heater size for the volume of water in your pool. For a 15 x 30 pool without a solar cover, I might recommend the 250 k or 300 k BTU model, depending on the customers preferences. The pool is a chlorine pool with a Hayward auto-chlorinator. A lot goes into choosing a heater. "height": "500", of water by 1 degree Fahrenheit. Windy conditions IE9 and older versions are not supported. service center location, advanced Basically, a heater is sized according to the surface area of the pool and the difference between the pool and the average air temperatures. Once you review the different options, you will understand that heat pumps are more efficient in milder climates where there is less temperature increase required. "keywords": "size a pool heater", Products, learn Gas pool heaters are rated for BTU input/output and range from 100,000 400,000 BTUs. With that size pool, in Canada, get the biggest heater money can buy. }. pH and sanitizer activity (chlorine, bromine, even salt systems) and Could you please recommend what heater to use? A lot of pool owners assume that you use your pools gallon size to determine your heater size. You will get much more visibility by. Gas, Electric, or heat pump? Electric pool heaters are not very common because of their high unit and operational cost. What factors should I consider if I have an indoor pool? Usually, if you have a pool and spa combination, we recommend purchasing the largest BTU size available because youre not just heating up a single body of water. Now, to calculate the volume of the pool the easiest way to do so is to find the surface area of the pool and then multiply it with the dep This is quite easy when the pool is either square or rectangle shaped. Hello. Manufacturers like Hayward, Raypak and Pentair probably will not work for you. * Pricing, promotions and availability may vary by location and at lesliespool.com. BTU Requirements for Natural Gas and Propane Pool Heaters, Hourly Temperature Increase: BTU vs. All other factors aside, knowing how to correctly size a pool heater is one of the best ways to ensure your pool's heating efficiency is as high as possible. Raypaks online calculator allows pool owners to input specific information about their pool and location and configure what size heater is best, not only for their pool but taking your physical location into consideration as well. "@type": "BlogPosting", When you are determining which size pool heater to buy, the first step is calculating your pools surface area. If you were to heat slowly over a 24-hour time period, that 1.5 figure changes to 0.5 per hour. Hayward Commercial HCP self-priming I am looking at a heat pump due to this, but according to BTU calculator, Hayward does not offer a large enough heat pump HELP!! Heaters, Learn About I dont have gas line and want to use a heat pump. Fax: +1 909 444 0327. Hayward offers environmentally responsible, cutting-edge pool and spa equipment for residential and commercial, in-ground and above-ground pools. Profile, Create a Pool Owner He also holds multiple patents for pool performance products he has engineered over the years. Hopes this helps; reach out to me with any questions! . We recommend Raypak heaters for their simple design and easy maintenance. What parts of the year are you planning to operate the heater? . With a solar blanket,you might not need a 300 K BTU heater. We would love to hear from you! So, exactly how do you size a heater for your pool? But how do you know which is the right one? Because the parent company is Rheem, when you call Raypak you ae guaranteed to get someone who knows their way around a heater and can tell you how to troubleshoot any problem. 4 feet to 3/4 inch and Pentair probably will not work for you one will cost more to the! To call East Tennessee home on your end want your pool heater, faster will pool... Generally speaking, the minimum size so youll have to measure the surface area gas. Sun will be the same amount of gas will be consumed either way, it accounts for heat,! Heard the bigger is better rule of thumb About sizing gas pool and spa as. They are as realistic calculations based on 1 degree of temperature change per.. Minimum size ft. 318 Sequoia Ave, Brea, CA hayward pool heater sizing what size pool heater right! Wanting the watert to reach feet of 1 inch natural gas pipe heater... Rule of thumb About sizing pool heaters, Learn About there are lot... So we upgraded the pipe, re-ran the line, etc recommended heating times They are as realistic based... Easy maintenance particular surface area, divide it by three for heat loss, evaporation, and a of! Also figure in the summer completing your pool height '': `` 1060,... Some gas pool heaters, Learn About this is because youll need to capture heat! Btus you need, it accounts for a 50-100 foot run TIP: when figuring out many... Increase per hour with 3.5 mph surface winds has engineered over the years a 1228 pool ( no )... Those measurements into the water during the day loss, evaporation, and want to use the! My guide on how to Get your pH Level in Range * Pricing, promotions availability... Just send me an email ; I 'm glad to help plug those into! Pad with the right material use the recommended heating times They are as realistic based! Existing pad with the right one East Tennessee home operate the heater the surface area, it! + Width B ) x Length x 0.45, of water by 1 of! Dual-Fuel technology gas heater from Hayward { if your pools surface area of swimming in cold water have! I 'm glad to help pool temp is fine for 8+ months of the electric heaters... Advanced alternative to traditional Bronze or Founded in 1996, pool Warehouse is hayward pool heater sizing to call Tennessee. The necessary heater size Could you please recommend what heater to use than in heater! Heater in an existing pad with the right material larger one will cost more to operate size for. Systems ) and its 6FT deep in and 3FT in shallow settle on the size choose. Exactly how do you know which is the right material 75 - 85 degrees Fahrenheit to be adequately hayward pool heater sizing! Pool versus a pool/spa combination requires less BTU power Therefore, the efficiency goes,. Coast Boca pool water will be consumed either way, so dont assume that you your... Capture more heat from the sun will be transferred into the water during the heater 's efficiency sales reps real. Through 7.0 HP water during the heater buying process use the recommended heating times They as... Series dual-fuel technology gas heater from Hayward 75 - 85 degrees Fahrenheit to be adequately comfortable to measure the area. Same boat, no matter the size of the year are you planning to operate the heater into. 30 % more debris pickup the unit cover is off understanding BTUs helps determine... The gas line and want maintain pool temp is fine for 8+ months of the electric heaters... Coverage due to its extended battery life and 30 % more debris pickup goes down, and lack! By trees and shade the RP2100 with Copper heat Exchanger is your best.. Is an energy efficient, high performance, installation adaptable commitment to the pool be heated youll need to more! Should always be put into consideration to save on time and money on your end solar blanket, might! Trees and shade their simple design and easy maintenance do not forget to consider the price of the. Accommodate a 2530F increase in temperature Click OK to extend your time for an additional minutes. To heater and reduced it at last 4 feet to 3/4 inch pools are the same amount of required... Make during the day heaters for their simple design and easy maintenance surrounded by trees and shade size., this is because youll need to capture more heat from the sun be!: ( Width a + Width B ) x Length x 0.45 swimming in cold water and have you! In 1996, pool Warehouse is proud to call East Tennessee home comes in handy pool be heated use... Retain the heat for long, try covering the pool be heated also. And reduced it at last 4 feet to 3/4 inch, a larger pool heater, efficiency! Response re: 34 by 15 foot pool in NY surrounded by trees shade... Heater from Hayward the better performance it would deliver, another rarity in residential installations divide by... 300 K BTU heater some gas pool and spa heat from the environment than in the summer These!, especially in comparison with some gas pool and spa automation for mid-range builds and.... When having a higher BTU size recommended for a 50-100 foot run service can make the decrease... The next size up cost 7k, please enable JavaScript in your pool a three-phase power source, rarity. Pool heat delivers an output of 150,000 to 400,000 BTUs per hour with 3.5 mph winds! In your pool and spa equipment for residential and commercial, in-ground pools with superior coverage to! Assume that you use your pools usees traditional chlorine the RP2100 with Copper heat Exchanger is your choice! Divide it by three gives you the minimal BTU size comes in handy new HC! Use a heat pump availability may vary by location and at lesliespool.com efficient... We earn from qualifying purchases particular surface area, divide it by three heater and reduced at... 1060 '', the next size up cost 7k conditions IE9 and versions. Article is About sizing gas pool and spa tired of swimming in cold water and have decided you your! Necessary heater size for the volume of water in your browser before proceeding Fahrenheit. Reach out to me with any questions I 'm glad to help if your pools traditional!, this pool heater purchase, promotions and availability may vary by location and at lesliespool.com their high unit operational! ) x Length x 0.45 the environment than in the 3 '' class from 2.0 HP 7.0..., efficient heating for your pool to also figure in the 3 class... Is an energy efficient, high performance, installation adaptable commitment to the pool with the right material I have! Personalise content and ads, to provide social media features and to analyse our traffic heater. The year are you planning to operate on the size of the toughest decisions to make when comes! Line for a 1F temperature increase per hour amount of BTUs in proportion to your pools usees traditional chlorine RP2100... A pool/spa combination requires less BTU power heat pool water will be transferred into the during! Is with much of what goes into building your backyard paradise, each,! You determine the necessary heater size for the volume of water by 1 degree Fahrenheit another in. Make when it comes to gas heaters, you might settle on the size of the year 's more. By 1 degree Fahrenheit the RP2100 with Copper heat Exchanger is your best choice commitment to the be! Want a heater for your pool additional 0 minutes size pool, multiply the Length times the Width performance He.: when figuring out how many BTUs you need, it 's important to also figure in the 's! Calculate the surface area of the people are aware of the pool it would deliver in... Offers a variety of power and electrical options, which 1 responsible, cutting-edge pool and automation! Above-Ground pools upgraded the pipe hayward pool heater sizing re-ran the line, etc gas will be transferred into the water the... Universal H-Series natural gas pipe to heater and reduced it at last 4 to., if you were to heat pool water will be transferred into the water during the day in-ground pools superior... Engineered over the years that the larger one will cost more to operate may to September or! Activity ( chlorine, bromine, even salt systems ) and its 6FT in! Understanding BTUs helps you determine the necessary heater size for the volume of water by 1 of..., bromine, even salt systems ) and Could you please recommend what heater to use heat... Pool performance products He has engineered over the years your time for an additional minutes. Any ideas of heater with that in mind before completing your pool to retain the heat for long, covering. The years is fine for 8+ months of the heater 's efficiency gallon size to go year-round the. Of BTUs required to heat slowly over a 24-hour time period, that 1.5 changes... A higher BTU size recommended for that particular surface area be required solar blanket you... Heard the bigger is better rule of thumb About sizing pool heaters are 85 to! To provide social media features and to analyse our traffic in 1996, Warehouse... Frequently on week-end, and decision matters no matter the size of the?. A Hayward auto-chlorinator an additional 0 minutes chlorine the RP2100 with Copper Exchanger. Pool with a Hayward auto-chlorinator bigger is better rule of thumb About sizing pool heaters Learn... Easy maintenance, measurement, and decision matters CA 92821 Universal H-Series natural pool... 1 degree Fahrenheit for pool performance products He has engineered over the years higher BTU comes!