Boiler Guard

I would ask myself what i would be trying to achieve by having one.
If it is the ease of auto filling, then that suggests regular filling is required, which points to a problem that should be sorted out before the whole system gets damaged.
If it is the flow/flood warning, then it would do no more than a properly disconnected filling loop.

I just don't see a need for it. It might even mask an undersized/damaged pressure vessel, though it does say that if gives a warning of too much filling. In that case the problem would show up in a regular system and would need to be sorted anyway.

Expansion and contraction doesn’t lose water from a correctly functioning system.

Anyway I gave my input, as requested. There might be other views on it.

Gagetman wrote: »

It doesn’t loose water but devices like the expansion vessel can loose its elasticity slightly, also the pump impeller can break down water molecules into its gas components H2O, that’s gas’s is then vented off through the vent valve. It’s a fact that heating systems have to be topped up from time to time

And how many litres would you expect to loose through this process?
Most unnoticed losses -and they would be small- occur from rad valves and weeping joints that in both cases are small enough to evaporate when the system is hot and might not even occur when system is cold.

So I stick by my opinion that the device mentioned in the op would have little practical use in a properly working system...and 200 Euro to boot. No thank you.