Hydronic pressure question

[5wndwcpe]

For you guys using an on-demand water heater (Takagi Jr etc.), what kind of operating pressures are you seeing ?

 

[5wndwcpe]

Okay, so it's 9 degrees out there right now and nobody has their heat running.

 

[Ron Lombardo]

All Residential Hydronic heatings sytems should run between 12 psi and 15psi. Some run hiher depneding on the head pressure from multiple level homes. Hieght creates head pressure.

My heating system in my barn 3 stories is running about 20 psi ...

Dont forget the relief vlave pops at 30 psi

Ron

 

[5wndwcpe]

All Residential Hydronic heatings sytems should run between 12 psi and 15psi. Some run hiher depneding on the head pressure from multiple level homes. Hieght creates head pressure.

My heating system in my barn 3 stories is running about 20 psi ...

Dont forget the relief vlave pops at 30 psi

Ron

Thanks, that's what I was leading to Ron. The rep. where I bought the heater (Rinnai) suggested a 150 psi relief valve, which I thought was high for this application.