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Thank you for all your info! The idea of insulating the pipes is greatly appreciated, since I did not think of that yet and it probably will make quite a difference.

@Dana:
Thank you also for...

Thank you for your info so far. First thing I did was filling in more water to raise the pressure. The boiler now shows consistently a pressure of about 15 psi. I also adjusted the flow control valve...

the cold water feed to the heating system is always turned off, while the heating system is in operation. However, I found that the flow control valve was in the open position and not set to actually...

I have a model CG 6-SPDN boiler built in 1994 for my hot water radiant heat (radiators) and will be using it also for radiant floor heating in an addition I am building. It has been running fine...