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Metallo 05-21-2012 08:29 PM

Summer vacation - Water heater turned off
 
Hi,

I will be away for 1 month this summer and I will switch the main breaker off.
I wanted to know if I need to drain my water heater in addition to close the cold water supply.

When I come back, do I just need to open the cold water supply and turn the heater on or is there anything else I need to look at?

My heater is this one and by default it is set to 140F, in order to avoid any risk of legionnaires disease, should I wait at least 1h and then open the hot water and let it run for some minutes?

Thanks
Alex

Ravenworks 05-21-2012 08:52 PM

Set it to vacation mode on the thermostat.

Alan 05-21-2012 08:59 PM

I chuckled when I saw you mention legionairre's disease. I did some pretty extensive research on that during my apprenticeship, and concluded that it is nearly IMPOSSIBLE to catch it from a water heater.


If you're leaving during warm weather months, I wouldn't worry about draining it.

Shut off the cold water inlet to the water heater, and relieve the pressure off of the system.

For that matter, i'd recommend shutting off the water to the entire house.

It sounds from your description that you have an electric water heater?

Wildie 05-21-2012 09:04 PM

Quote:

Originally Posted by Metallo (Post 926092)
Hi,

I will be away for 1 month this summer and I will switch the main breaker off.
I wanted to know if I need to drain my water heater in addition to close the cold water supply.

When I come back, do I just need to open the cold water supply and turn the heater on or is there anything else I need to look at?

My heater is this one and by default it is set to 140F, in order to avoid any risk of legionnaires disease, should I wait at least 1h and then open the hot water and let it run for some minutes?

Thanks
Alex

I have a hot water heater at my cottage that is identical to yours. I just turn off the breaker when I leave and flip it on when I return. have been doing so for 30 years.
There is more danger from a burst water line causing a major problem.
Always be sure to shut the water main off when going on vacation.

Metallo 05-21-2012 09:08 PM

Quote:

Originally Posted by Alan (Post 926113)
I chuckled when I saw you mention legionnaire's disease. I did some pretty extensive research on that during my apprenticeship, and concluded that it is nearly IMPOSSIBLE to catch it from a water heater.


If you're leaving during warm weather months, I wouldn't worry about draining it.

Shut off the cold water inlet to the water heater, and relieve the pressure off of the system.

For that matter, i'd recommend shutting off the water to the entire house.

It sounds from your description that you have an electric water heater?

Yes, it is an electric water heater.
I will shut off the water in the entire house for sure.

Regarding the legionnaire's disease, I am originally European and we have a proverb which in English is: an ounce of prevention is worth a pound of cure' :yes:

Thanks!
Alex

AllanJ 05-21-2012 09:17 PM

I suggest turning off the water heater heat before the water is shut off.

The water heater heat must be shut off before the heater's tank is drained.

Water should be gushing from an open hot faucet before the water heater heat is turned back on.


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