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2014

Preheat cold water using tempering tank

Tempering tank

Tempering tank located in naturally warm area pre-heats cold water using ground temperature\

Resource
See groundwater temp map

Locate tempering tank in sunny area in warm climates

Use old water heater or buy scratch-n-dent 20-30 gallon water heater. Do not connect electricity unless needed. Insulate tank and pipes.
Buy
20 gallon electric water heater at Amazon

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
Resource
See groundwater temp map
Two water heaters
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Tempering tank

Tempering tank for tankless water heater

Often tankless heaters are undersized to meet customer price.
Winter time, customer discovers tankless can not heat water fast enough, and increasing temperature setting on tankless causes unit to shut down.

Tempering tank can solve problem by pre-heating water before it reaches tankless. 
Resource: Problem with tankless heater
1. Contact manufacturer's web site
2. Post problem on plumbing forum:
3. Don't install tankless
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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

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