Heat pumps?

[Andy Burns]

How can it end-up more expensive, unless your electricity is

5.0/0.9 = 5.5x the price per kWh of your gas?

After recent changes, mine is 3.8x

[Andrew]

And even worse when it is a single pipe system, as was the case with the house that my parents had built in 1956, with a parkray solid fuel stove (behind glass) with a back boiler feeding th hot tank upstairs and two downstairs rads from the same single pipe 28mm copper piping.

[Fredxx]

Sadly it doesn't include the concept of using gas to both generate power and heat in the home.