Hi,
I have a new pump/heater installation. All are Pentair products - filter, a new 1/2hp pump and a Minimax 100 natural gas heater, supplied as a kit from a good pool dealer. Everything is working fine - very strong flow from the pool, through pump, filter and heater, then back to the pool. Heater ignites and stays lit, burns strongly. However, the water isn't getting heated.
I noticed the 2" header on the heater includes a bypass valve. This is a small plastic disc held in place between the two halves of the header by a spring. The spring seems to me to be surprisingly weak, especially considering how well the pump works. This was the first thing that came to mind, so as a test I added a small spacer to the valve spring, effectively increasing its compression slightly. It made no difference.
So, my questions are; how long should I expect the heater to be running before I can tell there is heated water? I've waited a few minutes. Does it take a long time for the heat to penetrate the water headers in the heater? I would think a few minutes would be more than enough. Has anyone experienced a pump that is just pumping too powerfully for the heater to be effective with the volume of water? Is it common for the bypass valve to let a lot of water bypass the heater (I still think this is the most likely cause). Is it possible the heater headers are blocked (tho it's a new heater)?
Any help would be much appreciated... I'm running out of ideas! Thanks.
Pete