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Old 12-12-2019, 11:12 AM   #29
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Quote:
Originally Posted by Mudfrog View Post
It's definitely colder in Dallas than down here at times so I don't blame you for taking extra precautions

Just from my experience, 32° for a few hours or overnight has never caused a problem. I don't do anything. If 32° for more than 24 hours, or temps go into the upper 20s for more than a few hours, then I'll usually drain the water lines. Colder weather, say mid 20s, and I'll drain the WH. Middle 20s and below gets extra measures such as draining tanks, placing a lighted 75 watt incandescent bulb in the wet bay, and sometimes setting the furnace to come on at 35°.

This is just my opinion: I would not rely on a "turned on" hot water heater to keep the freeze off because there's always that chance it won't fire up about the time you're not looking. For peace of mind, I'd say it was better to just drain the thing.
Where is down here from Dallas? Normally I would guess you mean Houston, but this site is all over; so you may be in Florida to always be able say "down here". Long shot guess is Louisiana, but then you would be Mud Bug not Mud Frog

The wet bay has consistently stayed 5 degrees warmer during overnight. I set Furnace thermostat to 42 and left on but I only saw about 1 maybe 2 degree difference with ambient temperature dropping to 33. Remember sensor is in the wet bay compartment NOT the waterlines from within the coach running to it.

My next test is to do the same inside the water heater panel. I suspect it will be colder than wet bay due to the vent opening. I am going to guess the WH panel may be 2 degrees warmer than ambient if that?

I tend to agree about reliance on hot water heater to be on. If I am traveling or actively using it is one thing but when sitting in my driveway for storage, if I know a cold spell is coming in the 20's I am draining the WH, and the waterlines. Still not sure about when to drain the fresh water tank. The mass of the tank says it should be okay, but the water runs to the input side of pump which is in wet bay. If the wet bay freeze say at 27 degrees it may freeze the water and burst the line at pump if not damage the pump itself.

The other trick is that I will not keep the fresh water tank full during the winter unless I am traveling. That way if I do need to drain, I am dumping less water. Might keep it 1/3 full?
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Old 12-12-2019, 03:50 PM   #30
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Beaumont area, east of Houston.

I've never used a stand alone thermometer but I have checked the inside temp with the rig's built in thermostat. Going by it, the coldest it's ever gotten inside was 41° after being in mid 20s outside temperature for several hours. I can't remember it ever staying in the 20s for more than 24 hours down here but I imagine it happens up there at times.
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Old 12-12-2019, 10:22 PM   #31
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Originally Posted by Mudfrog View Post
Beaumont area, east of Houston.

I've never used a stand alone thermometer but I have checked the inside temp with the rig's built in thermostat. Going by it, the coldest it's ever gotten inside was 41° after being in mid 20s outside temperature for several hours. I can't remember it ever staying in the 20s for more than 24 hours down here but I imagine it happens up there at times.
I have several of those La Crosse Technology clocks with portable sensors. They are great as you can put the sensors most anywhere. They are very accurate. I use the digital thermostat as well for inside the coach.

From my years of owning boats up here, it freezes just enough to put you in panic mode. That is why I have been playing with all of this so when / if a real freeze come, I will know what to do.

BTW, I bought a switch today from ACE hardware that I intend to add to my Water Heater so if I do drain it, I will shut the unit off in side the panel thus effectively making my own lockout without worry of the water heater switch in the coach. If it works it will effectively be my first true Mod.
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Old 12-13-2019, 05:03 PM   #32
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My 1st Mod: Water Heater Lockout Switch

It started with a will and it has completed with a way. Today, I have added a switch to the ground circuit to my Suburban Gas Water Heater. See On/Off switch to the left. It works effortless.

In future when I drain my water heater, I will flip the switch to off. Once done the switch inside the coach is effectively disabled. If the switch in the coach is On and it should not be; I get a red pilot light warning.
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Old 12-28-2019, 09:32 PM   #33
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Quote:
Originally Posted by Old-Biscuit View Post
That HOUSE 12VDC Panel with circuit breakers IS you DC Dist Panel


Although NOT labeled...Water Heater DC comes from one of those DC Circuit Breakers


Short the WH DC and see which one trips. (water heater only needs 2A)
But then you loose everything else on that circuit


Remove Ground Wire on Gas Valve Bracket...tape it off
No Ground...No workie
Logic wins again!
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