"Andrew Gabriel" wrote in message
...
In article ,
"IMM" writes:

"The Natural Philosopher" wrote in message
...

Shame that electric underfloor heating is
completely useless and a waste
of money to run

In a superinsulated houses it begins to
make sense as you woud use it so
little. The capital cost then is so low
that the usage is justified.

For someone so keen on high efficiency
heating, your sudden defense
of just about the lowest efficiency heating
you could use is rather remarkable.

This is in a remarkable situation - a superinsulated house. The figures add
up. There will be a long payback period and after that it is "comparatively"
expensive to run compared to a wet UFH system and a gas condensing boiler.
But, as it is used so infrequently the bills will still be very small. Also
with electricity, you don't need an annual service. Services calls when
things brake down, but no service, So it may all equal out over the year.

What you save by not installing a full wet heating system can be put into
the insulation costs.

BTW, is there a dc version of electric UFH, so roof PV cells can be used
directly on the elements with inverters?

While on PV cells. Alternative, with high capital cost, is a normal wet UFH
system, fed from a large thermalstore/heat bank. Use roof PV cells to heat
dc immersion elements in the water store. The thermal store will "store
energy" for use in DHW and UFH.



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