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yes, the house has been extensivly extended (not mine I might add).

1 x 3 port valve, the pump is a Grunfos 1560 variable speed.

22mm main run. MVs?

It's difficult to do that as you can't see a lot of the pipework as it's under the floorboards and buried in the walls. I do know it's a mix, some microbore and some 15mm

perhaps the runs are a bit long on some of the pipework but I don't think it's the pipe size, but I'm not sure, you might be onto something.

A large open vented system with 28 radiators 38kilowatt boiler (new) new pump, finding difficulties to get all radiators to heat up. Tried balancing, if you turn 3 off at one end of the house all the rest will run, but they won't all run at the same time. If you turn all the radiators on...