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I do not have a boiler, I have a buffer tank which is heated by a heat pump drawing heat from a lake loop plus I do not think that a temp of 90F (110 - 20) would be considered cold. The industry standard for radiators seems to assume entry temp of 180F with a return temp of 160F to yield...

I have a hydronic geothermal system with a maximum temp of 110 F. So far I have only installed staple up heating under the main floor using heat transfer panelsand PEX piping. The next step is to install some radiators in rooms where I can not do the under floor panels. Most of the specs for...