dennis@home coughed up some electrons that declared:



"Tim S" wrote in message
...

Now all I have to do is find a CORGI person who doesn't want 1200 quid
(labour) to install and commission a boiler (just the boiler, I'll be
doing
the rest).

Or I'll be doing that myself too.

Legal.
However some boiler manufacturers are being a pain..
Ravenheat give a three year warranty if its fitted by a Corgi engineer but
not if you do it yourself.
I suspect that this is an unfair condition if someone challenged it in
court.
They also state it has to be fitted correctly just to cover for the stupid
Corgi engineers that are out there.
£500 for a new boiler but if I fit a condensing one I also need new rads.
I wonder how much CO2 the new rads cost?
That's not a combi BTW, I don't want a combi.

Part of the advantage of using a thermal store being the decoupling of
boiler from radiators. Having spoken to Viessmann technical (who are very
helpful and don't ask for CORGI roll numbers!), they've told me I'll be
fine charging the store to 75C (hotter the better), but if I can arrange
for the return to be in the region of 45C or less for as much of the time
as possible then the boiler will operate at peak efficiency. Combining a
mixer valve and a speed controllable pump, I'm hoping to be able to satisfy
that, with a less efficient burn towards the end of the cycle to get the
water up the last 10C. (45C return = 65C flow according to documents).

The boiler will be switched on and off in a giant hysteresis loop, which
should help matters.

There's going to be a bit of suck it and see about this, but I'm largely
confident, given there's plenty of scope for tuning things after the fact.

Cheers

Tim