I'm going to use a flat plate HX for my system, so this question is more food for thought for other possibilities, but I'm not recalling whether it's been discussed before-
People have built all sorts of copper &/or PEX coils, manifolds & tube arrangements, etc., for in-tank heat exchangers for heat storage.
Has anyone tried or considered simply putting some good old fashioned cast iron radiators (ones built for a HW system, so that they have inlets and outlets) right into the tank?
Cast iron will experience initial corrosion, but usually that self-ceases near the surface, and a relatively closed tank should become at least partially oxygen depleted from the heating.
Interested in peoples' reactions to this
People have built all sorts of copper &/or PEX coils, manifolds & tube arrangements, etc., for in-tank heat exchangers for heat storage.
Has anyone tried or considered simply putting some good old fashioned cast iron radiators (ones built for a HW system, so that they have inlets and outlets) right into the tank?
Cast iron will experience initial corrosion, but usually that self-ceases near the surface, and a relatively closed tank should become at least partially oxygen depleted from the heating.
Interested in peoples' reactions to this