HLAH wrote:

Then get a highflow combi. Do a search on this group for Alpha CD50 a few
satisfied users. who will confirm the flowrates. They will a bath as fast
as any storage system and no tanks or cylinders.


Can you run a power shower with that?

Nope, you can't use any form of pumped shower on a what is to all
intents a mains feed.

A "high flow" combi will only be of any use if you have the mains supply
performance to feed it[1].

Going to the expense of laying in a new feed from the street main will
do nothing to increase the static pressure, but will usually improve the
flow rate (i.e. less dynamic pressure drop). If you only have 1 bar
static pressure then you are never going to get much of a shower from
that under its own steam.

[1] You can do other complicated expensive stuff using accumulators to
buffer incoming cold water which can give you a temporary boost to
pressure and flow rate, but this is pretty pointless if all it lets you
do is run a expensive combi solution in place of a far simpler storage
system that achieves an equal result for a fraction of the cost. (Of
course, for Dribble a Combi always = "better", but that is just him)

mains. Have an integrated heat bank running the CH from it. It is the
best solution and gives great scope and flexibility for the future too.

Out of date info. You will get better performance from most modern
boilers if you let them drive the rads directly so that the boiler can
sense the actual heating load and modulate accordingly.

Heating from the heat bank makes more sense if you want low temp feeds
for under floor etc.

I suspect all rather more expensive than the ｣419 tank that I am going to
have fitted.

Standard fare for a dribble solution, it will cost more, and he has not
thought it through properly.

--
Cheers,

John.

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