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Could anyone suggest a telephone number of someone who understands wet systems? Do hetas have a helpline?! Thanks

Oh and to confirm- I've looked at lots of diagrams- please confirm that the injector tee should be where the return from the pumped rad system meets the return from the the cylinder (the thermosyphoning system) Thanks

Apologies have been away for a while. Our plumber is coming back in, but he's now talking about fixing up a dump rad in the garage, which is easy to plumb, but the garage is not insulated. To me this seems like a massive waste of energy. His argument is that many homes have heat dumps in the...

Thanks. The dump rad is also worrying me. It is at the same height as the burner, but the pipes run up over a door and then down to it. Both flow and return are connected at the bottom of the rad. The flow pipe gets warmish, but the rad itself has never got hot, even when the cylinder (upstairs...

Many thanks. Is it possible that the wrongly placed injector tee could cause the backwards flow through the cylinder?

When the pump kicks in on our woodburner/back boiler heating system, water is drawn backwards through the cylinder, therefore cooling the water going to the rads. The chap who fitted it can't work out why. I've asked where the injector tee is, and he has fitted it to where the return from the...