The radiators some of them, I bought them cheap from motorbike shops the others I got them from a neighbour who dumps used radiators from automobiles, I can get 3-4 per week from him if I wanted to.
You mean the radiator loops are overkill?
I think the airflow in secondary loop is'nt good enough cos I can feel the air from it is very warm and slow. But they keep my water at 3C above ambient.
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