On 24/03/2018 19:25, Harry Bloomfield wrote:
I have decided my Ideal Icos HE18 is beyond sensible repair cost, I have
chucked enough at it, so I am looking now for a replacement...

It needs to be a regular, vented system type boiler, but if possible
with separate boiler output temperature controls when heating the hot
water tank, to that when heating the radiators. Yes I presently have a
room stat and a water tank stat. I just like the hot water to be able to
be very hot 80C, I appreciate that is above the efficient condensing
range, but to heat the radiators the boiler output temperature need not
be quite so hot. 18+ Kw needed as present boiler is adequate. The
predecessor to that was around 32Kw, but some good insulation has made
that high an output unnecessary.

I had no input into the boiler make last time around, this time I am
looking to Vailant or Worcester/Bosch for a more reliable boiler.

I've a Vaillant Greenstar of some sort, it has separate controls for hot
water and radiators but TBH I'm not sure how it works. All the manuals
are easy to download.

I have a simple W plan and IIRC the diverter is switched by the cylinder
stat. Don't know if the boiler temperature is controlled at the same
time with the default "simple" control system.

Boiler has been very reliable.