Solar pool heaters work by adding heat to the pool slowly over a long period of time. Its not going to heat the pool in one day. As a test case, We added a SPH-4 (4 collector system) to an indoor pool measuring, 38 x 18 ft with no other heating system on it. In this case the 4 solar pool heaters heated the pool from 62 Deg F to 81 Deg F in only 10 days during May 2011. The solar pump station was set to divert excess heat once the pool reached 85 Deg F. The excess heat was then diverted to heat the the Hot tub.
If this pool was only to be used in summer then one or two x 30 tube solar collectors would have been sufficient. However, in this case, 4 x 30 tubes solar collectors were added to allow more heat to be collected in winter to keep the pool warmer in winter months and also to help heat the hot tub.
As a rule of thumb we recommend one TZ58 1800 30R collector for every 100 square feet of surface area. Remember this is only a rule of thumb and location, wind and shading also play an important role. A pool cover is also very important.
So, if you have an indoor pool (or outdoor pool) you can use the pool as the primary place to put the heat from the solar collectors. Then any extra heat can be diverted to something else, lets call this the "secondary heat use"
This "secondary heat use" could be almost anything you want, for example.
- Domestic hot water
- Hot tub
- Infloor radiant heating
What this means is that if you plan the system from the start, you can add one or two 30 tube collectors to heat your pool, then later on you can simply keep adding collectors as your budget allows. The pool will still be heated but the extra heat will keep extending the season your pool will be warm then any excess heat can be used elsewhere in the home or business.