solar heated cast radiator, see it heat

hot_rod

I have this radiator fed directly from a 40 gallon solar supply.
The radiator is bottom feed, bottom return, flowing 3.5 gpm.
Shop is about 66°F. Tank was about 105°F when I started circulating.

After about 6 minutes of run time the radiator is warming nicely.

Observations: high flow does heat cast radiators, even with flow straight across the bottom. I drilled a manual bleeder into one of the "flowers" on one end top section.
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mattmia2

It is portable if you have enough heater hose...