Solar pool heating systems will save you lots of money, and reduce reduce greenhouse gas emissions.
Pool heating is a very good solar application. The systems are simple and relatively inexpensive. Pool systems usually use simple, low cost, unglazed plastic collectors. The pool itself is the thermal storage for the system, and the pump you already use for filtering pool water will also circulate water through the solar collectors. All of this leads to inexpensive systems -- some of the simplest solar pool heating systems cost as little as $100.
Some states offer tax incentives for solar pool heaters.
Directory for this page:
Two NEW ideas for homemade pool collectors
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Pool Cover -- A must | |
Pool Cover -- a must
One of many, many suppliers of pool
covers: |
![]() "Pool covers cost between $85 and $150 for most residential pools. In fact, all of the other pool heating methods discussed in this article should only he used in conjunction with a pool cover. Not to do so would be like running your house air conditioner during August with the doors and windows open. The system will still work, but the operating cost will be as much as three times" higher." David Boehmer. Pool covers work by reducing evaporation, which accounts for about 70% of pool heating cost. Clear covers have the advantage that they not only reduce evaporation, but also allow solar gain through the cover. |
Fuel Cost Savings for Using
a Pool Cover
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![]() For example: Denver without cover $2120, with cover $168. |
Solar
Rings Do a Google search on "Solar Rings pool" |
![]() I have been a bit skeptical of how well these would perform, but have a report form one person that is quite happy with them, so they may be a candidate if you don't want to mess with a full pool cover. Not as good as a full cover, but much better than nothing? (thanks to Amy for suggesting these) |
Solar Pool Heating Basics | |
Solar Pool Heating Basics, Two part
article Tom Lane "Three gallons of oil refined and burned provides 400,000BTU ... Once. Three gallons of oil, made into a 4 by 12 foot solar collector, can provide over 10 million BTUs per year ... year after year" |
![]() ![]() Home Power magazine articles, issues 94 and 95. VERY good hands on how to size and install a pool heating system. |
FESC Solar Pool Heating, Florida Solar Energy Center
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![]() They cover collector sizing, economics, system installation, and provides collector and system ratings based on FSEC testing. While aimed at Florida residents, the information is widely applicable. |
Conserving Energy and Heating Your
Swimming Pool with Solar Energy, National Renewable Energy Laboratory (NREL) Download here... (pdf)
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![]() The material on sizing the pool pump and how much circulation time is required is very good, and could save you up to 75% in pumping energy. |
Residential Solar Pool Heating
System Natural Resources Canada Buyer Guide (1.8MB pdf)
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![]() Shows that solar pool heaters can show VERY good payback even in the "frozen north". |
Solar Site Survey...
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![]() This free and simple survey only takes an hour and is fun and educational. |
Solar Pool Heating Collector Sizing Calculators |
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Installation Manuals and Specifications | |
See also the first article above
from Home Power Magazine on pool heating basics. |
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SunTrek Solar Pool Heating Installation Guide... (pdf) The Suntrek site has other helpful material and supports DIY installations... |
![]() Just a wealth of good practical install info. Many roof styles covered, and good coverage of ground mounting racks as well. SunTrek's collectors are basically matts of EPDM tubing that connect to 28 inch wide manifolds. Its a very flexible system that allows collectors of just about any width and length to be built... |
Solar Pool Heating System
Installation Florida Solar Energy Center
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![]() Colder climates may require some changes for freeze protection if not drained. |
RimStar
Solar Pool Heating http://rimstar.org/renewnrg/solarpool.htm
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Hot Sun Industries
The installation manuals give quite of detail on installing pool heating systems. |
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SolarHOT Detailed instructions on installing pool heating collectors...
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![]() The instructions have a lot of generally useful information that might be helpful in your installation. Other helpful info on their site including manuals, piping diagrams,... |
Above Ground Pool Heating Example From SmartPool...
Another supplier: (Note: I don't know anything about either of these suppliers -- its just a place to start looking) |
![]() About $110 for one panel and $170 for two (the
picture shows two panels).
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Costco currently has a 40 sqft pool collector of this type for $99.99 -- what do you think the payback period for this collectorl is ... |
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AMECO Solar http://www.solarexpert.com/poolheat.html
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Homemade Pool Heaters |
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Tom's PEX/Aluminum solar pool heating collector Full details on construction...
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![]() ![]() It should be a very efficient collector. Be sure to protect all PEX from sun exposure -- this is particularly important when Chlorine is present in the water. Note that Tom's collector leaves no PEX exposed to direct sunlight. |
A Large Ground Mount Solar Pool Heating System www.mindchallenger.com/solarpool/ |
The author measured the collector output at over 100,000 BTU per hour -- equivalent to more than 1 therm of natural gas per hour, or 30 KWH per hour! Lots of detail on building the ground mount system. |
A Pool Heating Collector from PVC Pipe Full details on PVC pool heating collector... |
![]() It uses readily available materials and is easy to construct. It can be sized to the exact space you have available. Full details on PVC pool heating collector... |
Matt's inexpensive, simple, PV power pool heating
collector Full details on construction...
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![]() Matt used a PV powered pump, so the pool pump does not need to be run, and no external power is used for pool heating. For more on why this simple design works well, see the entry just below. |
Simple Pool Heating Idea
Gary |
![]() See the entry just above for an actual very nicely done real implementation of this idea.
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Solar Pool
Heater in Tuscany http://rimstar.org/renewnrg/solar_pool_heater_diy_fp.htm
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![]() Good detailed description. Very flexible plumbing arrangement. Good performance numbers (see note below for more on performance) Thanks to Steve for sending this in! |
A nice pipe coil solar pool heater for a 9000 gallon in-ground pool www.mildevco.net/solar_pool_heater.htm |
![]() The system is fairly simple to build and the total cost was only about $200, which should give a very fast payback. |
A very
large pipe coil solar pool heater http://pasarlascanutas.com/...
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![]() Very nicely done, lots of good detailed pictures, and some performance data. Its in Spanish, but the Google "translate" button is your friend. |
Solar Thermal
+ Cheap = Inexpensive Pool Heater! whereisholden.blogspot.com/... Here is an updated post with more details and questions answered... |
![]() Total cost $300 -- compared to commercial system bids of $5000! |
Very Simple Pool Heater from
SugarMtnFarm
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![]() I was a bit surprised that such a small collector (only about 10 sqft)
was able to do worthwhile heating, but the secret is keeping the pool volume
fairly small. Walter's pool has about 14,000 lbs of water to heat,
where a 20 ft diameter by 4 ft deep pool has almost 80,000 lbs of water to
heat -- a good reason to use a small pool! |
My Homemade Solar Pool Heater Andy http://www.thecasualtraveler.com/solar.htm
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![]() Performance data coming later in the Spring. Details ... Andy has some other renewable energy projects in mind, so keep an eye on his website. |
Video on a Pipe Coil Pool Heater
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Homemade pipe coil solar pool heater http://rimstar.org/renewnrg/splyucca.htm
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![]() The collector is piped off the main circulation pump and receives a small fraction of the total pump flow. The 12 kw output is a bit hard to swallow given the size of the collector, but the collector appears to work well and cost little -- hard to beat that. |
Gull Industries Pipe Coil Pool Heater
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Paint South Side of Pool A Dark Color Details... |
![]() Details... |
Thoughts on Efficiency of the Various Styles of Collectors Shown Above In spite of the fact that most of the entries in this section are for pipe coil style heaters, I have slightly mixed feeling about how well these will work out for most people. All things being equal, a square foot of commercial mat style pool collector is going to be about equivalent to a square foot of a pipe coil collector. The message here is that its going to take a lot of pipe to to heat a pool. A 300 ft coil of 1 inch pipe has a solar collector area of 25 sqft, so its going to take a lot of pipe to get up to half your pools surface are. The Tuscany pipe coil pool heater (see above) provides performance numbers, and appears to verify that a given area of pipe coil will have the same performance as the same area of rubber mat style collector -- both about 80% on a warm summer day. I think that all of the DIY collectors shown above will have about the same heat output per sqft as the commercial mat style collectors, so, I think its mostly a mater or comparing costs and what fits for your location. |
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PV Powered Pool Pumps | |
A DIY solar powered pool pump installation All the details on design, build, and economics...
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The system uses two 170 watt PV panels to power a Speck Swimming Pool and Spa pump through a Lorentz controller. |
Field Studies of Two-Speed and PV-Powered Pumps and Advanced Controls for Swimming Pools,
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An interesting paper that looks at the savings for 3 approaches: 1) using a 2 speed AC pump running longer on low speed, 2) a PV powered DC pump, and 3) controlling pump operating time with a turbidity meter. Note that since the paper dates back to 1990, the costs of the PV system have dropped significantly and need to be updated for comparisons. The use of a turbidity meter to regulate pump on time seems promising, but I've not seen any further developments on this. |
Pool pump powered by grid-tied PV system |
As an alternative to a dedicated PV system for the pool pump (as above) one could add a grid-tie system that provides power for the home (including pool). This has the advantage of using the same system for both home power and for the pool pump. The downside of the grid-tie system powering a conventional AC motor is that it is much less efficient than a system that drives a DC pump from dedicated PV panels via a controller. It would be nice to get a precise comparison, but as a rough guide, the montly cost of running a conventional AC 1.5hp hp pool pump for 8 hours a day is about 400 KWH per month. A grid-tie PV system to generate an average of 400 KWH a month would require an about 3000 watt PV array. Contrast that to Bruce's (and others) use of about 400 watts of dedicated PV to direclty drive an efficient DC pump. |
Something Else to Try? | |
Taking the Plunge Naturally,
Mother Earth News Article: How to Build a Natural Swimming Pool, Buege Description of an article from
Permaculture Magazine: |
![]() Less impact, less energy, nicer looking, less expensive to build and
maintain. |
Natural Swimming Pools -- Conventional Pool Conversions, Michael Littlewood, 2011 |
![]() There is enough material on design and building in this book to be a good start on designing and building (or concerting) your own pool. The book is a UK book and most of the examples are from the UK, so if your climate is markedly different from the UK, you may have to seek additional information. |
Embedded Pool Deck Collector www.pacificgunite.com/solar%20pool%20heating.htm
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![]() Tubes embedded in the dark colored deck concrete pick up heat from the solar warmed deck to heat the pool. |
The Rutgers Solar Heating System
for Greenhouses Mears, Roberts, Simpkins, and Kendall Rutgers University The Rutgers Solar Heating System for Greenhouse - 1977 (0.8 MB pdf) Greenhouse Solar Heating-1981 (2.5MB pdf)
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![]() While I do not know of anyone who has tried this as a pool heater, it seems to me it might work well, and it would be very inexpensive -- perhaps $2 per square foot? The papers give information on a several greenhouse energy schemes, so you have to wade through all this to find the details on building the collector. The collectors described in the paper are quite large, but could be scaled down. Note that even though this is a very simple collector, there are details that you must get right for it to hold together -- so read all the construction notes. If you build one of these PLEASE let me know -- Gary A number of other interesting commercial greenhouse related papers at the Rutgers Horticultural Engineering Website: http://aesop.rutgers.edu/~horteng/ |
Old Swimming
Pool Converted to a Greenhouse to Grow Produce and Fish http://gardenpool.org/ |
![]() Pretty ingenious. Their motivation for doing this is to be self sufficient in case of a major disaster, but it could certainly work for people not expecting a major disaster. The family was featured in a National Geographic special on major disaster preparation --the video shows more details on the system they set up... |
Hot Tubs | |
Hot Tub Energy Use Hot tubs use a staggering amount of energy. The Davis Group says that annual energy use for a hot tub in a mild climate is around 2500 KWH per year, and that for people who own hot tubs, the tub will likely be their largest energy use. To put this in perspective, 2500KWH is equivalent to running 5 refrigerators, and will result in about 4000 lbs of carbon emissions per year. Energy use in cold climates is even greater. So, 1) really evaluate whether a hot tub is worth all this energy, cost, and carbon before you buy, 2) look for the most efficient one you can find -- paying extra for a well insulated and energy efficient tub will save you money and reduce carbon emissions, 3) have a very good cover and use it, 4) use one of the solar or wood heating schemes listed below. |
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Solar Collector Size to Heat a Hot Tub... |
![]() The method is based on the size of your hot tub and how much your hot tub temperature drops over a 24 hour period. Using the temperature drop takes into account how well you tub is insulated, how you use it, your climate, and all sorts of things that would otherwise be hard to account for. |
My Solar Heated Hot Tub Bob Owens |
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Glazed PEX Collector for Hot Tubs
-- experiences
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Tom reports on a couple schemes to heat his hot tub with a glazed PEX
collector, and with a copper collector. Here
are the results... The results of Tom's testing make me wonder how good a solution the Home Power article above is. |
Woodstoves for Tub Heating (or for
heating thermal storage tank?)
Chofu: supplier (one of many): Mother Earth News article: Wood-Fired Hot Tub, Stocking
Snorkel and Scuba Underwater Woodstoves:
Cowboy Hot Tubs:
Alumi-Tubs Inc. |
![]() It uses a simple thermosyphon system to circulate heated water (no pumps, no electricity). The full stainless steel case is a water jacket for efficient heat transfer. ![]()
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How to build a wood fired hot tub, from Instructables
http://www.instructables.com/ ...
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Brian's $350 Solar Heated Hot Tub
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Build Your Own Solar Hot Tub, Robert Herman www.hotspringsenthusiast.com/SolarTub.asp
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![]() The author used a stock tank and a used solar collector to keep the total cost down to $100. The collector is hooked up as a simple thermosyphon, so that no controls or pumps are needed. |
A Low Tech
Hot Tub & Solar Heater http://eco-ants.co.nz/projects.html
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(I think there is some risk here of getting the plastic pipe to hot if the collector stagnates -- see notes on our PEX collector and stagnation) |
Large
Drainback System for Home and Hot Tub www.solarbair.com/articles/horsecreekarticle.html Eric's site home page: |
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Tom's 330
sqft Solar Space Heating System This is another larger solar heating system that includes Hot Tub heating. Full design and construction details... |
Tom's very well done solar system for heating the house and domestic
water heating. This is a great project with details on design and
construction of a large solar collector array, a larg![]() ![]() This is Tom's 3rd generation of building solar water heating collectors, and he has incorporated refinements in each generation -- the collectors are efficient and well proven.. |
Some Additional Thoughts on
Tub Heating Given the very large energy consumption of hot tubs, maybe its worth considering some of these:
Any other ideas? email me... |