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Tankless will not heat water ... preheat cold water using staging tank

Staging tank

Staging tank for tankless water heater

Tankless heaters can be underpowered in winter when incoming water is cold.

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

Insulate pipes

Stick man pointing
Wah hoo, tankless is not working again.
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Staging tank
Electric water heater not working
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During winter, staging tank in basement or crawlspace warms cold water using ground temperature see groundwater temp map

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 water resevoir. Copper lasts longer than steel tank <> 320 feet of 3/4" tube = 20 gallon

Summer: Staging tank or copper tube located in sunny location gives net energy benefit in daytime summer hours > heat energy can be stored but cools quickly without thick insulation
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