Rob R. wrote:If the relief valve is opening with the boiler at 200 degrees, your expansion tank is either water logged, under-inflated, or undersized.
Glad the boiler is running better.
NWBuilder wrote:I will look into the expansion tank.
Dennis wrote:I changed over from a 30 to 90 expansion tank. when temps were at 200 degrees my pressure was around 28 psi with the 30 tank,now with the 90 tank the psi is only 15.