He also gets coins out of it? That at the moment could be worth more? There are several axis of 'cost' vs 'perf' vs 'utility' vs 'efficiency' that would need

He also gets coins out of it? That at the moment could be worth more? There are several axis of 'cost' vs 'perf' vs 'utility' vs 'efficiency' that would need to be graphed out to see if it is actually worth this setup. He is seeing cost as a major concern. Getting coins for a set amount of energy and using the extra heat as offset for his heating bill. So I could see if you did this right it could come out better. But that would need to be graphed out.