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One zone, do I need two pumps?
I'm building a single zone radiant heating system, 300 sq. ft. and 300' of ½" PEX, for my garage/shop. I will use an electric on-demand water heater as the heat source. Probably an EcoSmart ECO-11. The primary loop will run at 105 degrees. My question is, do I need to install two circulating pumps, one for the primary loop (Taco 003) and one for the zone (which is the way my existing radiant systems with multiple zones are plumbed), or can I use a single pump in conjunction with a mixing valve? If the latter would work, I need to size the single pump for the head loss in the entire system (i.e. a Taco 006).