In message , Vir Campestris
writes
On 13/11/2020 19:02, Cliff Topp wrote:
We currently have a condensing boiler up in the loft but it's
knackered and will be replaced soon with a Worcester Greenstar 30i.
The current boiler has a built-in filling loop but as I get older
it's getting more difficult to get up there to top up the system.
Does anyone know if the Worcester Greenstar 30i has a filling loop
built in or would it be possible to place a 'remote' filling loop and
pressure gauge in the piping as it goes up through the airing cupboard?

You shouldn't need to keep topping it up. That water is coming out
somewhere... ask the boiler fitter about it.

It could be something as simple as a bad expansion vessel.

Or a leak making your floor joists damp and rotten

This is currently exercising my mind:-)

Having drained and re-filled the primary loop recently, I have become
aware that setting the system pressure exactly to that of the expansion
vessel leads to alarming pressure drops as the entrained air slowly
escapes via the auto bleed valves.

Stabilising now and I have stopped running round the house with a torch!

This must happen when plumbers do a system flush and re-fill from the
mains.

--
Tim Lamb