Howdy All , a month ago I installed a new Rheem/Raypak 399 BTU heater . After install everything worked great ! Now the heater fires just fine . But once fired up it only heats the spa , but when valves switched to pool no warm / hot water to Pool . The Pool is approx. 30k gallons , after install it would heat the pool 2 degrees an hour , but now nothing ! I'm lost how can this be ? So, again heater running just fine when valves on spa lots of hot water ! Then valves switched to pool , heater still fired and no hot water to pool . Thanks !