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Redoing Dumb Hot Water Loop in kitchen (indirect, heat)
Good news is I paid a flat price for the plumber to install an indirect hot water loop to heat the new 16'x14' addition (kitchen + mudroom + bathroom). Bad news is that the three radiators don't heat the space. I've done all the tweaking - opening buderus panel valves all the way (plumber had them half-closed), adjusting temperatures on indirect tank (triggers circulator at 175F, off at 185F), etc. Space is new construction, well-insulated. I've narrowed the problem to two solutions: 1) There is close to 5,000in^2 of tubes for this loop, because the dumb plumber didn't understand how surface area works and ran the hoses all the way around the basement... for fun, I guess, because it cost him $$$$ in supplies. I don't need/want the radiant heat from these tubes - if anything they're heating a different zone in the house, unhelpfully. I've measured and a much-more-direct 2,500in^2 loop is possible, but obviously that's a redo. 2) Other solution is to add another baseboard radiator to the loop, but if the loop is losing too much heat already then another heat sink won't be great ROI, not to mention punching more holes through the new tile floor. Or I could do both.
In mid-winter the loop circulator is on constantly, and can hold the temperature of the room but doesn't increase the temperature. If I'm cooking with the stove or oven that heat is enough to heat the room and it stays warm for hours and then the loop can hold that temp (running constantly). The three current radiators (1 6' baseboard, 2 buderus panels) measure a surface temp between 120F and 140F. So we're losing 40-60F from the indirect tank en route, and probably the same coming back. I've even spent $200 wrapping the tubes in insulation, which bought me ~25F at the radiators. But not enough. So frustrating.
Question: Do you think redoing the loop, cutting surface area in half, will be enough to bring the radiator surface temps up to ~160F? My arithmetic makes me think it will work, but what do people who do this in the real world think about this? ...I know math isn't always the answer. Thanks!