"Neil Jones" wrote
| Soil heat recovery systems are even cheeper .............
| 400% efficient, for each 1 unit you put in, you get 4 out - wow !!
| But, electricity isn't much less than 4 times the price of gas.
| Slightly less wow.

Of course, for people who can't get that nice cheap mains gas ...

| You can get fridges which run on gas - could this be scaled up to a heat
| a house?

At this time of year, perhaps cooling a house would be more appropriate.
Gas-fired air conditioning?

Owain