How to get the hot running well?
QI’ve just bought a 1970 Elysian 27 and the hot water flow is very slow. Should I install a higher pressured pump? Could the calorifier need de-scaling?
Scale in the calorifier would not affect the flow rate because it would be on the outside of the heating coil, but it would extend the time taken to heat the water.
AIt’s probably best not to fit a higher pressure pump unless you can establish the opening pressure of the pressure relief valve that protects the calorifier.
My guess is the pipe run for the hot water from pump to calorifier to tap is quite long. This is probably causing more friction that translates to a lower flow rate. Check the diameter of the pipes and any hoses, I would want to see at least 15mm internal diameter and possibly increase the diameter of the pump to calorifier pipe to 22mm.