"Andy Hall" wrote in message
...
On Tue, 26 Aug 2003 02:48:42 +0100, "IMM" wrote:
If using two combi boilers one can supply heating for downstairs and
one
for
upstairs giving natural zoning and both zones on separate timeclocks.
True, but two large boilers are going to require an upgraded gas
supply, I suspect.
As long as it's below 62kW combined all is fine. You can go over this,
although they may not like it, as the meters have 100% overload.
Gas pipework still needs to be adequate, as does the rest of the
delivery system including main from the road, regulator etc.
I had understood that Transco installs larger versions of all of these
if the supply requirement exceeds 62kW. That being the case, do you
think that they would support the idea of exceeding this figure on a
domestic supply?
I'm not sure as these *******s are out to make money not provided a service.
The old British Gas Corpn, certainly would. I can recall a house with three
100,000 Btu multi-points and the supply uprated at no extra cost to the
customer. It only required a larger meter.
The issue is producing a large enough flow of hot
water to run a multihead and a normal shower simultaneously....
19-20 litres/min is probably not going to be enough.
Depends on flow.
That's ultimately going to be the case with any mains fed water
heating system.
Two combis is probably the best bet.
I think that that is questionnable. If a boiler running at 46kW
input can generate 18 litres/min, then selecting 62kW worth of combi
in two boilers would suggest a production rate of 24 litres/minute.
Even assuming that the water supply is up to it, this rate is only
barely adequate to run a multihead and a standard shower
simultaneously.
But it never runs out of water!!!!
And always backup if one drops out. No very large space consuming and
expensive stored water cylinders for either: heat bank, unvented or vented
cylinders. Multi-head showers use a hell of a lot of water and people tend
to stay in them longer, especially people using them for therapeutic
reasons. A simple, cheap and effective solution.
Divide and rule.
Cheap too, £800-900 to do the lot
Using the very cheapest products on the market, and not including
installation costs.
That is decent mid priced kit. Buying two combi's will give a discount from
a dealer.
and have backup if one drops out.
That would involve extra pipework and valves.
Not it would not. The heads on the multi-head shower can be split between
combi's. If one combi drops out just don't use the cold head and the other
combi and head supplies.
Cheaper than a a boiler with an unvented
cylinder and a two zone heating system.
Maybe, but it would be a pointless saving if it was not fit for
purpose.
It should be.
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