Yeah, being that we are drawing our water from the bottom of a big lake, the water in winter is pretty much going to always be 39F (temp at which water is its densest). On paper, I can get 3.5 gpm from that (for an 80F delta-T, with 142kBTU/hr output power). I have never observed any problems in winter with our hot water availability. I usually set my thermostat to 126F, or sometimes 120, and use added heat on the DW. When you have a continuous supply of hot water, there is no advantage to setting the temperature high.
As an aside, for conventional tanked systems, there is a danger of setting the temp so low, because buggies (like Legionella pneumophila) can grow at this temperature. But since we're not holding a tank of water at 120F, we don't have that problem. And we have less danger of scalding.
As an aside, for conventional tanked systems, there is a danger of setting the temp so low, because buggies (like Legionella pneumophila) can grow at this temperature. But since we're not holding a tank of water at 120F, we don't have that problem. And we have less danger of scalding.
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