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Are there problems if you turn off water heater using timer.
Are there problems when turning off heater for several days
Timer
Turning water heater on-off with a timer has no effect on water heater, health or bacteria.


Resource:
Box timers
T100 series timers
Gas water heater timer
Intermatic freeze control PA102 Freezing
Protect water heater from freezing. Set to vacqation
If heater is off for a long time.

Resource:
Prevent-water-heater-freezing.html
Resource
How to make a freeze outlet

Buy 178T24 Thermostat for electric heater
Freeze thermostat Amazon
Inline freeze switch/ 15 amp max
Hydrogen
There is one consequence to idle hot water heater in rare circumstance....
if you are on a water well.,..
... an unheated water heater for several weeks can cause build-up of hydrogen when the harmless bacteria reacts to anode rod....
usually it is a rare combination of events.... but known to happen
Resource:
Outgassing.html

Bacteria
If you are concerned with bacteria.... water heaters can be cleaned with hydrogen peroxide or bleach... I recommend harmless hydrogen peroxide...

Resource:
How-to-clean-a-hot-water-heater-with-bleach
Replace-anode-rod
Bacteria
There is another condition that can introduce bacteria into the water system.
Siphoned water from water hose...
Any water hose left in a pond or swimming pool can draw water back into house through the hose faucet located on side of house.
How it happens.... you run water inside house... and the movement of water creates suction against closed outdoor faucet ... and the rubber seat on outdoor valve is slightly leaking... this action pulls contaminated water into house.
Some areas require anti-siphon valve on each outdoor faucet.
It's recommended that you never leave hose in pool of outdoor water.

Resource:
Repair-water-heater-valve
Affect of timer or power outage on Electric water heater:
Ordinary electric water heaters are not affected at all by on-off.
Whirlpool Energy Smart electric water heater is not affected by on-off.
Commercial 3-phase and 1-phase electric water heaters are unaffected by on-off.
Some heat pump or hybrid water heaters are reset to factory defaults if they are turned off.
Tankless electric are not affected by power loss.
Resources:
Compare water heater timers
Troubleshoot electric water heater
Whirlpool energy smart
Commercial 3-phase water heater wiring
How to wire tankless electric water heater
Gas: propane and natural.
Ordinary gas water heater, with electronic or old-style gas valve, are not affected... and have a vacation setting that keeps tank from freezing if you do not want to turn completely off.
Some water heaters with blowers, and power dampers must go through a reset series after power loss, which causes a delay in restart but otherwise no problem.
Commercial gas water heaters I do not have resources on all the varieties and types to make generalization.
Resource:
Gas water heater timer
Troubleshoot gas water heater
How to install gas water heater
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Resources:
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How to install electric water heater
Troubleshoot gas water heater
Troubleshoot electric water heater
Point of use water heaters
Resources:
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Icon gas valve

How to replace water heater element Waste King disposal
How to wire tankless electric


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Titan tankless

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Anode rods anode rods
Recirculation system

Tankless recirculation
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