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How to save Hot water using a mixing valve

How does mixing valve save hot water?
Remember, a mixing valve is exactly what you do during shower ... you add cold water to hot.
Each faucet; bath, kitchen, shower and tub faucet is a mixing valve... where you manually adjust water temperature by adding cold
Each time hot tap is turned on, new cold water immediately enters bottom of water heater as hot water leaves top of tank going to shower..
When you use mixing valve located at water heater instead of mixing valve located at shower, then you save the amount of hot water that travels down the pipe going to shower.
How much hot water is saved?
Every 10 feet of 1/2 pipe holds .12 gallons of water.
If bathroom is 20 feet away. 3 showers per day .72 gallons per day x 365 days = 262 gallons of cold water that does not enter tank.
That means 262 gallons of cold water is not heated to thermostat set point.
The math can be more complex than this 2-D example. But a mixing valve keeps more cold water out of tank, and water heater stays hotter
Adding mixing valve is required for solar water heater. Because sipping Hot is important strategy for preserving the solar heat stored inside water heater.
Rule of thumb... if it's good strategy for solar... then it's a good strategy for regular tank too.
Water heater is energy battery. Don't drain the battery.
Mixing valve
Mixing valve adds cold water to hot line so water temperature remains constant.

1) This lets you heat tank full of very hot water during good solar days if you use solar heating.
2) This lets you heat full tank of hot water during low peak pricing periods overnight.
3) This lets you send very hot water to washing machine on separate water line, and send tempered hot water to other water line going to faucets and kids bathroom.


Mixing device kit

Kit has more features/ scroll down for mixing valve without kit

I run my water heater upper and lower thermostats at max (150F they are NOT heavy duty 170F thermostats). See thermostats
I have my mixing valve set so I get 112F water (my preference) on the hot side at the kitchen tap.    

Without a mixing valve I would have to set my thermos at 110F instead of 150F.  Because I have a higher setting on my thermostats I can store the excess energy from a sunny day (solar heat), or store excess heat from low electric price.
The water heater stores energy. .. basically the extra BTU it takes to heat the water from 112F -> 150F).  
I think my calculations are that my 105 gallon water heater can store the equivalent of 150 (or more) gallon water heater depending on the incoming cold temp (time of year related). 

With the mixing valve my water heater stores about 20-25KWh of energy.

Do you have a mixing valve in your setup?

Buy from my affiliate links:
Mixing valve kit at Amazon
Water heater mixing valves at Amazon

Resource:
Mixing valve .pdf
Mixing valve spec sheet
di-electric nipples

Use di-electric nipples for connections at top of water heater

Di-electric nipples help prevent corrosion at water pipe connections
Di-electric nipples are good replacement for factory-installed heat trap nipple that might cause clogs and noise
Buy

Di-electric nipples
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Mixing valve kit
Larger image

Mixing valve kit installed on top of tank

This installation shows standard gas or electric water heater
Mixing valve kit installed on top of tank
5 total ports for connections

Laundry/ washing machine / receives very hot water
Sinks and bathtubs receive tempered water at lower temperature

Mixing valve has a thermostatic setting knob
Mixing valve automatically releases cold water into the water going to sink
The cold water reduces temperature of water that travels to sink
Resource:
Mixing valve .pdf
mixing valve Mixing valve
Honeywell mixing device

Honeywell mixing device/ valve only (no additional outlets)

Simple mixing device can be added at water heater or under sink
This can solve problem of uneven hot water arriving at tap
Children can be protected from scalding at their bath or faucet
Typical temperature range... 80-120 degrees / or 100-140 degrees
Honeywell mixing device    

Buy:
Water heater mixing valves at Amazon
80-120 degree range
Resource:
Honeywell mixing valve spec sheet
Typical installation sheet/ pdf
Mixing valve

Mixing valve installed with pipes

This installation shows example gas water heater
Mixing valve installed to side of tank

Laundry/ washing machine / receives very hot water
Sinks and bathtubs receive tempered water at lower temperature

Mixing valve has a thermostatic setting knob
Mixing valve automatically releases cold water into the water going to sink
The cold water reduces temperature of water that travels to sink

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