DIY solar attempt in dublin Aug 5, 2014 4:33:34 GMT -5
Post by cye on Aug 5, 2014 4:33:34 GMT -5
i don't think that's an issue with the paint and you shouldn't worry. paint is never a good insulator due to the fact that it is so thin. what they mean by heat resistant is that it will not peel off. i'd say it is exactly what you need, provided its not a very shiny black. cast iron stove paint is also good and will be something similar.
the innards of that type of radiator are not complex, it's essentially two sheets (well one sheet folded in half, and with the corrugations missing at the fold) of corrugated heavy steel sheet, folded over on itself. The point of contact, i.e., the vertical narrowest points, are spot welded together. if you look carefully you should be able to see the spot welds. there are essentially then two large bore horizontal channels (forming header and footer 'manifolds') connected by a whole array of narrower bore vertical channels or 'risers'. Domestic radiators are available with ports both top and bottom, but unfortunately not all. a port cut off a scrap radiator could easily be brazed onto the flat outward face at the bottom left of that radiator, and whilst the average plumber would not have the skills, your local old-timer type motor mechanic may do.