Remodeled House. Now Radiators Are Way Too Large

Alan (California Radiant) Forbes · June 2

We installed this boiler and radiator system in 2017 when the owners purchased this house. Nothing had been done to the building since it was built; single glazed windows, no insulation.
I sized the radiators for 130F water temperature as I wanted the boiler to condense and they turned out very large. My supplier says I order larger radiators than anyone else. I suppose that’s a compliment.
Recently remodeled, the radiators are now way oversized and I can drop the heating curve even lower. It’s now set to 1.1 with zero offset and the radiators will only get warm, not hot. Safe for their new children and more savings on their utility bills.

bjohnhy · June 2

Nice. Is the reason for the reduced heat lost because of their new insulation, windows, and air tightening? I suppose you do not have a new design water temp yet? But now much lower than 130F?

Big Ed_4 · June 2

Flat curve comfort too..

kcopp · June 3

Not over sized… sized for max efficiency.

Did this w/ my own home. Cast iron rads. love it.

Kaos · June 3

If somebody decides to install an air to water unit in the future, they will thank you!

GGross · June 3

and a sweet little Mesa combo amp in there too, you didn't use that as your table during the project did you?😁

hot_rod · June 3

what sort if delta do you design for? With a 30 delta you have some cool return temperature

You were “future-proofing “ before it was in the news!

Alan (California Radiant) Forbes · June 3

@bjohnhy On a design day, 100°F water temperature.

@hot_rod This is the job I showed you when you were here. When you saw the boiler, you said, "You did this?" as though you couldn't believe I could do such nice work. I just cracked up.

Remodeled House. Now Radiators Are Way Too Large

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