Quote:
Originally Posted by bigskypc50
Greetings everyone I have very cold ground water and very low pressure where I live. I have not had good luck with tankless water heaters in the past, so I am wondering if I bought two of the Excel tankless ventless water heaters and fed the output of the first unit into the second one if I could get good nice hot water out of that at the max 1.6GPM flow they are rated for?
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personally, I've got great pressure... But, being the inquisitive one, I've experimented with my eccotemp L5.
I've got a portable hottub, and had a harbor freight transfer pump 12volt laying around... I plumbed to pick up water from the tub, feed through the heater, and back out to the tub... worked awesome! now, I did not run it back through a shower head to see if I'd like the pressure... but, what I saw on the outlet hose was similar to my regular water supply pressure.
Bryan at Eccotemp showed me how to adjust the propane burner and water pressure inlet to a range outside of factory specs, with 2 adjustment screws... so, that along with a standard garden hose ball valve... I can hit 192 degree outlet temps!
I know it doesn't answer your original question... but it might give you an idea what your heater is capable of.
personally, I think hitting the second heater with hot water isn't going to help you much. there might even be a high limit switch incorporated in your heater.
HF pump $39.99... wait for a sale!
https://www.harborfreight.com/12-vol...ump-63324.html
garden hose ball valve
https://www.amazon.com/Gilmour-Conne.../dp/B0006U66B6
also created a PEX manifold with Shark Bite ball valves and fittings to go to the shower and clothes washer... has worked great for over 2 years
Shark Bite fittings are awesome, because they're reusable!