"Roland" wrote in message
...

If you are on the usual schemes for
embedded generation at the
domestic level promoted in the UK
you might pay 8 pence per unit for
your electricity taken from the grid,
but only receive 2.5p for electricity
you supply. This discrimination
vastly increases the time
to repay your investment making it
unprofitable to install in the
first place without other incentives
such as direct grants.

So the rumour goes. Electricity is a "by-product" of these units. So, if you
are in winter and heating the house and DHW you will get 1.1/1.2 kW of
elecricty, which you will not be paying 4 times the price of gas to use. Any
suplus that goes into the grid, that you get money for is a bonus. You don't
use these unit for electricity only use, as there is too much waster heat.
Although, depending on the cost of producing electity, It still may be
financially worth it, even wasting heat.

They work well with large thermal stores. One long burn to heat it up and
use the stored heat on demand. A control system to monitor stored energy in
the store and electricity demand may be useful. If say there is electricty
demand for a tumble dryer the units can cut in and store the surplus heat in
the store. A level of spare storage may have to be kept, when for large
electrity demands, then it stores to maximum capacity, in volume and
temperature.

As long as gas is 4 times cheaper it will be feasible. With large takeup,
and mass production, the units will be well priced. But I would prefer to
use two combi's.



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