Good Sam Club Open Roads Forum: No hot water during a freeze
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 > No hot water during a freeze

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markchengr

Seattle

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Posted: 12/26/20 07:39am Link  |  Quote  |  Print  |  Notify Moderator

Probably puts clothes pins on his gasoline line.

Bobbo

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Posted: 12/26/20 08:10am Link  |  Quote  |  Print  |  Notify Moderator

markchengr wrote:

Probably puts clothes pins on his gasoline line.

Never heard of that one before.


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Lantley

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Posted: 12/26/20 08:50am Link  |  Quote  |  Print  |  Notify Moderator

wa8yxm wrote:

J&R wrote:

Hot water will freeze before cold water.


That is a myth


It's not a myth. It's basic high school chemistry


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noteven

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Posted: 12/26/20 09:20am Link  |  Quote  |  Print  |  Notify Moderator

What is not a myth is if the supply line to or from your hot water heater freezes hot water will not appear at the taps.

Scout around for where lines are run are they inside the heated space under a cubbard up against a cold wall? If yes open the doors to the space and turn the heat up to about 90. Crack a hot water tap on. When it starts to spit and flow the line is thawed. If you have a small fan to move some air through the space with the doors open that's better yet.

If your lines are outside in the cold oops

valhalla360

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Posted: 12/26/20 09:29am Link  |  Quote  |  Print  |  Notify Moderator

If you are in Florida as you signature implies, wait until this afternoon and it should fix itself...of course be on the lookout for leaks in case a pipe or fitting split.


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rhagfo

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Posted: 12/26/20 09:47am Link  |  Quote  |  Print  |  Notify Moderator

noteven wrote:

What is not a myth is if the supply line to or from your hot water heater freezes hot water will not appear at the taps.

Scout around for where lines are run are they inside the heated space under a cubbard up against a cold wall? If yes open the doors to the space and turn the heat up to about 90. Crack a hot water tap on. When it starts to spit and flow the line is thawed. If you have a small fan to move some air through the space with the doors open that's better yet.

If your lines are outside in the cold oops


Well seeing how the water connections to the WH are in an interior space I think the supply line is less likely than the hot water line after the the WH freezing. This would only be likely if the WH was remote from all other water using devices, which is not likely.
More likely is the hot water line, after the heater run in a somewhat cold space. In our 5er we have a run of about 15’ where the lines (cold and hot) run in the floor space (2”) on the outside edge of the floor. If we will see extremely cold temps, I will likely put some put some of the foil bubble wrap under that area.
My bet is still on the exposed hot water low point drain.


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Old-Biscuit

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Posted: 12/26/20 10:04am Link  |  Quote  |  Print  |  Notify Moderator

rhagfo wrote:

noteven wrote:

What is not a myth is if the supply line to or from your hot water heater freezes hot water will not appear at the taps.

Scout around for where lines are run are they inside the heated space under a cubbard up against a cold wall? If yes open the doors to the space and turn the heat up to about 90. Crack a hot water tap on. When it starts to spit and flow the line is thawed. If you have a small fan to move some air through the space with the doors open that's better yet.

If your lines are outside in the cold oops


Well seeing how the water connections to the WH are in an interior space I think the supply line is less likely than the hot water line after the the WH freezing. This would only be likely if the WH was remote from all other water using devices, which is not likely.
More likely is the hot water line, after the heater run in a somewhat cold space. In our 5er we have a run of about 15’ where the lines (cold and hot) run in the floor space (2”) on the outside edge of the floor. If we will see extremely cold temps, I will likely put some put some of the foil bubble wrap under that area.
My bet is still on the exposed hot water low point drain.



Why would a hot water low point drain affect hot water flow at a faucet......LOW point drain

My bet issue is AT the WH Tank...cold in or hot out
Cold in could be frozen
Hot out...check valve jammed/clogged


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Old-Biscuit

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Posted: 12/26/20 10:06am Link  |  Quote  |  Print  |  Notify Moderator

Bobbo wrote:

markchengr wrote:

Probably puts clothes pins on his gasoline line.

Never heard of that one before.


Vapor Lock on gas line
Clothes pins to dissipate some heat and stop/prevent vapor lock

Heat Sink

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Posted: 12/26/20 10:12am Link  |  Quote  |  Print  |  Notify Moderator

Hot water does freeze faster than cold water and is known as the Mpemba effect, however the reasons are not understood. The Wikipedia link below is a reference. The article however is focused on open containers and doesn’t suggest what the results would be for a closed container or for water under pressure. So, it’s not clear that this applies to hot water in a RV. Some of the possible reasons could be independent of the container or pressure.

https://en.wikipedia.org/wiki/Mpemba_effect


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Posted: 12/26/20 11:08am Link  |  Quote  |  Print  |  Notify Moderator

Heated water does not freeze. You need to add heat to the pipes to get them to flow again.


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