mm0fmf brought next idea :
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?

I have a Greenstar 24i which replaced a non-condensing boiler. It is fitted
where the old boiler was. Rather than make a huge mess moving lots of pipes
for the old traditional vented system with tank, the zone valve is its old
place in the cupboard with the hot water tank. The CH header tank was removed
and the filling loop is in the cupboard tapped into the rising water feed to
the loft cold water tank. There's a loop and a remote pressure gauge along
with 2 valves. It reads nearly the same as the gauge on the boiler. I treat
the boiler gauge as gospel, read that and go and see what the other says and
then add how ever much I want and check the relative change on the filling
loop gauge.

Great, thanks.