Raypak Heater 266A - 266,000 BTUs - Leave it ON?


Bronze Supporter
Jun 13, 2016
Twin Cities MN
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
My question is, can I leave my Raypak heater on all the time? For example, I have the pump schedule to go on at a certain time, and then it's off overnight, coming back on in the morning. I have the heater set to 78 degrees. Will it damage the heater if the water flow stops for several hours given the pump schedule? My assumption is that the water pressure switch in the heater will make sure that the heater isn't heating when there isn't sufficient water flow. Is that true?

My hope is that by setting the pump to run at certain speeds at certain times, I can basically use the heater's water pressure switch to control when the heater kicks on and off, depending on pump circulation speeds.


In The Industry
Jul 14, 2014
Pressure switch is part of the safety system on a heater. It really shouldn't be used for this purpose. While it will work as you ask, if it fails the heater will not turn off, and that is not pretty (I think I still have pictures). It is much better to have a timer send power to the heater in conjunction with the run time of the pump.
Thread Status
Hello , This is an inactive thread. Any new postings here are unlikely to be seen or responded to by other members. You will get much more visibility by Starting A New Thread