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Yes, a rubber coupling should do the trick. You need a soft material to make the seal. Or better still, get a longer section of pipe so that there are no joints.

How did you connect the bathroom ceiling vent to the ducting?

The 2nd fan seems to be to provide a boost. But when the 2nd isn't switched on, it will impede the free flow of the air.

How much more would it cost?

The filling/top-up loop could be located at the same level as the highest radiator in the house. Just saying.

But it would be able to do that even if the pressure in the system was say 0.3 bar My question was, why operate at 1 bar system pressure (as most boilers seem to) instead of say 0.3 or 0.5 bar?

How much for all that work?

?? The expansion vessel is only there to accommodate the water expanding as it is heated up. In gravity fed systems the expanding water went to the tank in the loft.

A domestic combi boiler/system for DHW and central heating. Why does the system have to be pressurised to 1 bar. Why not 0.2 to 0.5 bar? When the pump runs, that will also create pressure in the system. Thanks

How did you get on with this? Sounds similar to a boiler installed in a loft.

Did you get it sorted?

The flip side of the argument Some tradesman charge an arm and a leg to fix simple things, and would the tradesmen not just do the same thing, minimum cost max profit

Thanks for the tip. Good idea. At this stage, just looking to control the room thermostat. Will move on to TRV's later. My current TRVs are all manually controlled.

I prefer Bluetooth, as wifi isn't always on.

Really looking to have more control over the boost function. Looking for increments of say 1 or 5 or 10 minutes)

Evening Looking to get boiler and central heating cover. Anyone used any of the smaller companies and are they any good: - warranty people - corgihomeplan - heating247rescue - etc thanks

Evening For the home central heating system, I am looking to replace the very basic room thermostat with one that has more advanced features:- - Programmable, ideally have settings for each day of the week. - Bluetooth capability so can be controlled from Android smart phone. - Boost feature...

Why would you want to do it?

This is a known issue and easy to fix.

As the cylinder is not leaking now, it's highly probable that the plumber "fabricated" a leak to "generate" some extra work/income - and they are know for doing this sort of thing. And then did the job properly the 2nd time round. Epitomizes the trust worthiness of many trades and not just...