Quote:
Originally Posted by Saga Lout
A good % on the boiler, mine is old now but when I put it in I lagged every pipe and then foil taped over them, the water returning to the boiler is almost as hot as the feed because of the insulation on the pipes, it shuts off the thermal valves fairly often and isn't running cool water much through the system. I'm wondering if you lagged the pipes like I did you'd see an upgrade in % efficiency.
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Your returned water, for best efficiency, should be as cool as possible, so it takes up the boiler's heat more efficiently. The best boilers are able to modulate their output, so they provide just the amount of heat needed, to match the demands.