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Preheat cold water using tempering tank

Staging tank
If water heater is not working:
Electric water heater troubleshooting steps
How electric water heater works
How to troubleshoot tankless water heater

Staging tank in basement or crawlspace warms cold water using ground temperature see groundwater temp map

Use old water heater or buy scratch-n-dent 20-30 gallon water heater for staging tank. Do not connect electricity. Insulate pipes.

Net energy gain when staging tank heats from natural ground warmth or heat-pump exchanger or sun exposure

Copper tubing can be used to make tempering reservoir. Copper lasts longer than steel tank <> 2.5 gallons per 100 feet of 3/4" tube
Staging tank

Staging tank for tankless water heater

Many tankless heaters are underpowered so they meet customer price objective.

Winter time, customer discovers tankless can not heat water fast enough.

Staging tank can solve problem by pre-heating water before it reaches tankless. 

Stick man pointing
Wah hoo, water heater is not working again.            
Troubleshoot Rheem tankless

Troubleshoot Bosch tankless
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flue pipe heat exchanger

Flue Pipe Heat Exchanger

Roll flexible copper around solid PVC pipe to make heat exchanger. 

Flue pipe gets hot each time gas water heater turns-on.

Check Local Codes may prohibit heat-exchanger on flue pipe
<> cold water in copper tubing could reduce flue gas temperature to point where flue gases may not properly draft up chimney
<> do not obstruct air draft opening on top of tank
<> flue pipe must maintain upward tip so gas draws through pipe = minimum 1/4" per foot
<> insulation near flue pipe is fire hazard
<> if flue pipe comes apart see, extreme danger of  CO carbon-monoxide poisoning

<> rusted flue pipe may not be venting properly > check for obstructions in pipe > check flue cap on roof > raise angle of pipe and reduce number of elbows
heat exchanger heat exchanger
Make heat exchanger using lathe or manually wrap copper around PVC pipe

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Control water heater w/ Z-wave
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Preheat cold water using tempering tankCountdown timers Compare countdown timers

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