On 3 May 2004 15:21:20 -0700, (Rob Graham)
wrote:

I've done a trawl of the archive and I've found some answers, but in
some ways some more questions.

I've a 12 metre plus run to the kitchen sink from the HW tank with
only a 3 - 4 metre head, and have compounded the problem by fitting a
pull out mixer tap which has a high insertion loss. Various solutions
have been played with but a local heat source off the mains seems the
best option.

Just how good are under-sink heaters ? what is the storage types ?
why do they vary in power from 2.2 to 9.5Kw? What is the problem with
expansion - I would have just a short pipe run to the mixer tap ?
Would I be best to arrange a longer run ? I've seen something about
vented taps - how do these things fit in with an ordinary mixer?

Any help would be appreciated guys, many thanks.

Rob

Undersink heaters come in two power ranges. 2-3kW with storage which
will deliver a reasonable volume of water to fill a sink, wash hands
etc. They will do this at good flow rate, but once the store is
empty that's it. They can be run from a spur on the ring circuit.

The 8-10kW models are "instantaneous". They deliver water at a
reasonable rate although very slowly in the winter. They need a
special circuit delivering about 45A to the heater - rather like one
of the pathetic electric showers.

Certain types of heater are OK with a standard tap, others need a
special tap or have installation rules.




..andy

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