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And then only tailpipe emissions

That's the most stupid argument I've heard for a long time. What would you expect?

Gatso cameras flash (from behind) but Truvelos have little or no flash.

Quite. I only switch something on when I need it on. I don't need a smart meter to tell me it's using energy.

I don't think it's a medical problem, as it's easy to put somebody out painlessly for an op, so similar to kill them. The problem, in eg USA, is that they don't want it to be too barbaric, but don't want it to be entirely stress-free either, because where's the deterrence or retribution in that...

Make sure the inhibitor is up to strength, then when you've released all the air (or more likely hydrogen), you won't need to do it again

I never thought I'd agree with you :giggle: but I fit most of that

With another different name

OK, it's not my cooker, I posted out of curiosity. I didn't see how to use a manometer, before spotting the obvious, isolate at the meter and connect the manometer downstream.

I don't know, but some on here say it's OK, others that it's not. In any case a leak will soon be detected by smell

OK, but consensus seems to be that even if no pressure drop is found, it's still not acceptable to rely on the bayonet fitting.

Do you mean the previous boiler didn't have that problem? Maybe increasing the pump speed would help, if it's an option on that boiler

How do you use a manometer in that situation?

Any idea what he meant?

I’m getting lost here! You said in #5 "it doesn't, by design, allow the pump speed to fall any further once the residual head falls to 100mB, the pump speed was remaining at ~ 75/80%" Am I right thinking the pump speed modulates to try to achieve a setpoint dT? I assume the varying boiler...

I'm not clear what your problem is. If it's just that the pump doesn't turn down below a certain point so (assuming the boiler is controlled on flow temperature) you lose some condensation, maybe you just have to live with it.

Perhaps some red Hermetite or similar on the seal. Stops most leaks

That's what I thought. So by body in #3 you mean the pump head? Is it an O-ring? Replacing that might do it, if a new one didn't come with the new head.

Reference to the screws made me think you'd just removed the motor. If you fitted a complete pump, isn't it a faulty unit? You wouldn't normally expect to separate the motor, just fit the whole thing. Less I'm missing something.

Is it possible to adjust the 100mb setpoint, perhaps Vaillant can help? If on falling heat demand the pump reaches its allowed minimum head (hence minimum flow), the dT falls. Does it maintain flow temperature, so return temperature rises, or maintain return temperature, so flow temperature...