Hot Water: Difference between revisions

Revision as of 19:59, 3 March 2021

Pain threshold for a human is 106F [1]
If water is 60F year round from a supply - does 39F rise (see Tankless Electric Water Heater) suffice?
- 60+39= 99F.
Average shower temp is 105F [2]
- This article says that 99F is better, so you potentially avoid eczema
It appears that 120F water is a relic of long piping - the hotter the temp the quicker your water will get warm. But for on-demand, lower temperatures appear to be better.
Thus - minimize piping length to point of use. [[Seed Eco-Home specification is keeping heater distance to within 4' of point of use.
Earth temperature is constant 30' below surface - this is called the mean earth temp. [3].
Earth temp varies significantly with seasons - to full seasonal variation - at surface. [4], Thus, water pipes, at 3' or so below, show large variation of seasonal temperature.

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 *It appears that 120F water is a relic of long piping - the hotter the temp the quicker your water will get warm. But for on-demand, lower temperatures appear to be better.
 *Thus - minimize piping length to point of use. [[Seed Eco-Home specification is keeping heater distance to within 4' of point of use.
+*Earth temperature is constant 30' below surface - this is called the mean earth temp. [https://www.builditsolar.com/Projects/Cooling/EarthTemperatures.htm].
+*Earth temp varies significantly with seasons - to full seasonal variation - at surface. [https://www.builditsolar.com/Projects/Cooling/EarthTemperatures.htm], Thus, water pipes, at 3' or so below, show large variation of seasonal temperature.