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Variable speed pumps
I installed a Grundfos Magma 32-100 pump for a full house radiant floor system and I am amazed how little energy is used to distribute so much heat! The system is currently pump 16 [email protected] 13' and is ONLY using 63 watts!!!!!!! This is incredible. These pumps are huge energy savers considering I am using continuous circulation distribution. The home is 10,000 ft2 with a heat loss of 160,000 btus. Amazing to think an old school 100 watt light bulb uses more energy than the system pump. Also, something to consider is the fact I have been using the Viessmann Vitocrossal CU3A medium mass boiler that I use direct pumping. Meaning, the pressure drop is so low, non restrictive and has 20 gallons of storage, that I am using one pump for the radiant floors and one for the DHW. Super simple and highest efficiencies since there is no mixing the return water....direct return. I love this boiler and system
Cheers Jeffrey
Cheers Jeffrey
Jeffrey Campbell
0
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Comments
It's nice to have access to all that data also.
I sent you a couple PM about that radiation sensor, not sure you received them?
trainer for Caleffi NA
Living the hydronic dream
That said, you are clearly guessing at what size boiler you might need. There is only one way to determine that: do -- or have done -- a Manual J heat loss calculation for the house. Slant/Fin has a very nice calculator here: https://www.slantfin.com/slantfin-heat-loss-calculator/ which is remarkably accurate -- and easy to use.
You are quite right in thinking that too big a boiler isn't a good idea. In fact, it is a financial catastrophe. Do it right.
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch