On 11/02/2019 17:45, Chris B wrote:
On 11/02/2019 16:50, The Natural Philosopher wrote:
On 11/02/2019 16:46, Fredxx wrote:
On 11/02/2019 14:44, Darksyphon wrote:
Large extension added to my 3 bed property. Combi has been a pain in
the arse
and now won't cut it with 2 main bathrooms.

My question is should I go for a system boiler with an unvented
cylinder or
get a conventional boiler and have pressurised ch and again an
unvented hot
water cylinder?

Plumbing in the extension hasn't started yet and I plan to put the
unvented
cylinder in the gurage.

My plans were for the system boiler but I met a plumber who said to go
conventional.

A system boiler implies a conventional system. You have a choice of
unvented, vented or thermal store.

I went for the thermal store as the cylinder isn't pressurised so
doesn't need inspection and testing while still having high pressure
hot water.

TBH I suppose I just did the first inspection and test of my
pressurised cylinder in 16 years after replacing all the pressure
bits... :-)

Personally I'd still go for a pressurised system

Thermal store almost as good.

Can depend on location.Â* Thermal store in old house suffered from major
scale up in the small bore pipes that run through the thermal store to
provide HW.Â* Filling a bath ended up being so slow that water was
cooling down faster than hot water being supplied.Â* Just barely
acceptable for shower or washing up.Â* Probably worse than a combi. A
Water softener may have helped but there wasn't one fitted,

I think anyone who doesnt fit a water softener in a hard area in a
property they expect to inhabit for a decade or more is a numpty

The damage done to shower fitments especially is massive. Not to mention
the internals of a complex hot water system

I think IF you are going to upgrade a DHW system fitting a softener is
probably step 1. Even a combi will scale up eventually.


--
Those who want slavery should have the grace to name it by its proper
name. They must face the full meaning of that which they are advocating
or condoning; the full, exact, specific meaning of collectivism, of its
logical implications, of the principles upon which it is based, and of
the ultimate consequences to which these principles will lead. They must
face it, then decide whether this is what they want or not.

Ayn Rand.