Maximum demand calculation

This replacement of gas by a heat pump is mad, gas will always be cheaper whatever the alleged efficiency (COP) of the heat pump claims. However much we point out the illogical “Green” agenda is faulty, the more that people seem to believe it.

Realistically your 100A supply will be sufficient, until the day they realise that the gas shower has been replaced by an electric one of similar performance. Remember that a system that takes 100A is costing about £100 per day, and very few except perhaps Bill Gates can afford that for long! The socket circuits in a gas-heated house rarely have very much load, and 100A main fuse will pass 140A for quite a long time without failure. If there are many houses like this the substation will probably fail first! There is likely to be a 400A fuse protecting 80-100 houses if the area is not very modern, or perhaps 600A if it has failed a few times. This is the future to be expected soon.

This replacement of gas by a heat pump is mad, gas will always be cheaper whatever the alleged efficiency (COP) of the heat pump claims. However much we point out the illogical “Green” agenda is faulty, the more that people seem to believe it.

Realistically your 100A supply will be sufficient, until the day they realise that the gas shower has been replaced by an electric one of similar performance. Remember that a system that takes 100A is costing about £100 per day, and very few except perhaps Bill Gates can afford that for long! The socket circuits in a gas-heated house rarely have very much load, and 100A main fuse will pass 140A for quite a long time without failure. If there are many houses like this the substation will probably fail first! There is likely to be a 400A fuse protecting 80-100 houses if the area is not very modern, or perhaps 600A if it has failed a few times. This is the future to be expected soon.