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Akridgepointe 11-13-2012 04:21 PM

Buffer tank aquastat?
I want to make an indirect water heater into a buffer tank to supply my floor heat. If I want the buffer tank to have a low limit of 100 and a high limit of 180, how would you accomplish that with an aquastat?im basically looking for a high limit aquastat with an 80 degree differential. Most aquastats have a max 30 degree differential. Thanks

Bondo 11-14-2012 04:55 AM

Ayuh,... In floor radiant heat usually uses water at 150 to 170....

Donno why you'd want the buffer to call for heat at 100, which is too cold, or shut off at 180 which is atad high...

Akridgepointe 11-14-2012 10:26 AM

My in floor radiant supply temp is close to 100. It varies based on outdoor temp, it has an injection mixing valve. It is a constant circulation system. If I have a buffer tank at 180, the injection pump can make 100 degree water for a long time. That tank would be usable almost down to 100 degrees, at that point the injector pump would be running and near 100 percent ( and ready for more heat)

HVACDave 11-14-2012 01:02 PM

Likely easiest to just use 2 controls. Your supply temp to the floor at 100 is good, most piping manufacturers recommend less than 120 going into the floor as it creates too much stress on the piping if it is heated past 120 and can crack the pipe and/or possibly crack the concrete.

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