A radiator is only going to heat one room I would need them all over the house.
To heat the house over night I would probably need around 30,000 btu per hour for 8 hours, or 240,000 btu. Let's say I had a tank of water and was able to heat it to 140°F and then drop the water down to 120°F before the sun came up.
To store 240,000 btu with a 20°F drop I would need a 1,400 gallon tank of water that's roughly a 8x8x16 tank of water, a big tank or a small swimming pool.
So no.
Fire better.
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