Grundfos pumps in a radiant floor heat closed loop system
Hi, we have an off-the-grid cabin in the mountains with hydronic radiant heat in the floors. The heat source is a combination solar and a Takagi JR heater. We’ve switched it to a closed system with a heat exchanger and glycol in the floors since we aren’t up there all the time in the winter. We have 4 zones with between 1 and 5 loops of 300′ of 1/2″ PEX depending on the zone. The existing pumps are Grundfos stainless steel low volume pumps (sorry, don’t have the model number but they were installed in 2007). The pumps use enough energy that running them at night during the winter is problematic. Are there any newer pumps that could work in this system that use less energy? Thanks!
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