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Thread: Heated Holding Tanks
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04-20-2021, 08:04 AM #11
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04-21-2021, 08:41 AM #12
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10-01-2021, 07:36 AM #13
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My 2021 337RLS has tank heaters with switch. My question is. How do you know that they work? That area is all covered up.
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10-01-2021, 08:58 AM #14
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I don't have a tank heater, but since they are electric you could unplug shore power and try them. The energy the battery is putting out should spike a bit. This is assuming you have some type of battery monitor. If you have a fancy surge suppressor you may be able to tell when plugged in. Some electrician might have a better idea or explanation.
2021 Imagine XLS 22RBE
2021 Ram 2500 Hemi, Crew Cab Short Bed
2-206 AH SOK Batteries, Victron MultiPlus 3000VA Inverter, 800 watts solar
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10-01-2021, 08:59 AM #15
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You don't know, really - you have to trust. On the other hand, the tanks freezing is the last thing you have to worry about in cold weather. The water lines (especially the ones to the kitchen island in the 337), the water pump, etc. are your main concerns. Due to the mass of liquid in the tanks, it takes a lot longer at lower temperature for them to freeze. We wintered last winter at the top of the Chesapeake Bay in Maryland. We had several winter storms with up to 6" of snow and a few nights in the teens... I may have turned the tank heaters on a night or two when the winds were blowing.
RobU.S. Army Retired
2012 F350 DRW CC LB Lariat PS 6.7
2020 Solitude 310GK-R, MORryde IS, disc brakes,
Sailun LRG tires, solar, DP windows, W/D
(Previously in a Reflection 337RLS)
Full time since 08/2015
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10-01-2021, 01:17 PM #16
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I'll unplug and watch my victron to awe if it spikes. Thanks guys.
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10-01-2021, 06:05 PM #17
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2021 Imagine XLS 22RBE
2021 Ram 2500 Hemi, Crew Cab Short Bed
2-206 AH SOK Batteries, Victron MultiPlus 3000VA Inverter, 800 watts solar
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10-01-2021, 06:10 PM #18
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10-01-2021, 06:23 PM #19
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I have a battery monitor and these are my limited observations. In my 2018 Solitude (maybe different from your setup), each tank heater draws about 5 amps from the 12V when on. When cold enough with the (1) black, (2) grey and (1) fresh water tank heaters on it is about 19A draw. In my trailer, each tank is on both a rocker switch (on the convenience center) and a thermal switch (although Grand Design told me there was no thermal switch). The thermal switch looks like it turns on/off around 45 degrees, but that is a very rough estimate. In cold weather (in the low 20F), they will stay on continuously. Above mid-40s they are off (no current draw) even if the rocker switch is "on". Between those temperatures the heaters cycle on on off. I have only camped a few times when it stayed cold enough to test, so these are very rough observations. If it is warm during the day (50s) even getting down around 30F is not enough to turn the heaters on. Again, the furnace will heat the under frame area and there is a lot of thermal mass there.
Hope this helps
ChrisLast edited by CoChris; 10-01-2021 at 06:26 PM.
Chris & Karen
Fort Collins, CO
2017 F-350 SRW 6.7 Lariat Value CC LB 4x4
2018 Solitude 310GK - Sold 7/2023
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