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Control Strategy for SHW w/ Tankless Water Heater
Curious what strategies others are using to integrate solar water heating systems with tankless water heaters?
As most tankless manufacturers have set parameters for minimum delta T for incoming/outgoing water temps or maximum incoming water temperature, I'm curious how others have chosen to approach this.
The two options I've considered are:
1) setting the thermostatic mixing valve (from solar to tankless) a bit lower than typical (maybe 110-115F) and the tankless unit to 130-135F to maintain a 20F delta T inlet/outlet.
2) Installing a solenoid valve on the outlet of the solar storage that completely bypasses the tankless when the solar storage is above 120-125F and feeds the fixtures directly.
Again, curious what others have done and/or prefer.
Thanks in advance.