Heat accumulator

[Piwoslaw]

Originally Posted by NiHaoMike

As a test, what happens if you direct a fan over the pipe rising from the low bend to cool it down? Maybe why it's not working is because the pipe never manages to cool down enough for the trap to work.

Well, technically, I'd be losing more heat then, at least until it cooled enough to stop the flow

In fact, it is insulated pretty well, so a fan wouldn't do much.

I read here that good insulation of the loop/bend is one of the requirements for a trap to do its thing.

I also read there that a similar heat trap on the return might also be needed, so I have prepared all materials (including a second additionally weighted flap valve), just waiting for a day off with warmer weather, to turn off heating for a few hours.