Certainly something to consider, but they don't fail that often. I've had 1 issue to fix over around 10 years. The cost of that repair over the whole period is

Certainly something to consider, but they don't fail that often. I've had 1 issue to fix over around 10 years. The cost of that repair over the whole period is ignorable. Once you factor in the running cost, you're just spending more than the maintenance on the energy instead.