Recently did a complete system drain and refill. All rads are nice and evenly hot, but hot water is not as hot as before.
The hot water system that has a circ. pump and seems to have air in it as when the C/ H stat goes to off the boiler doesn't fire up for ages until the hot water flow pipe cools down, indicating to me there is air in the system.
How can I get the air out, there appears to be a relief valve in the boiler pipework after the c/h circ.pump at the top of a vertical pipe, does this need opening to release any air blocked in it or is it a pressure relief valve? I know this is not the hot water circuit as such but its all part of the central heating circuit on my old fashioned system.
The hot water system that has a circ. pump and seems to have air in it as when the C/ H stat goes to off the boiler doesn't fire up for ages until the hot water flow pipe cools down, indicating to me there is air in the system.
How can I get the air out, there appears to be a relief valve in the boiler pipework after the c/h circ.pump at the top of a vertical pipe, does this need opening to release any air blocked in it or is it a pressure relief valve? I know this is not the hot water circuit as such but its all part of the central heating circuit on my old fashioned system.