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Old 10-13-2010, 02:46 PM   #11
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I just checked my Roockwood 2604SS and the tank heaters seem to be DC. With shore power disconected the tank heater switch lites up when turned on.
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Old 10-13-2010, 02:53 PM   #12
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Hmmm...

Gratz, I think. Do you have a TM-2025?
I would love to know the DC amps they pull.

Apparently they make both kinds. Here is what the manufacturer has to say about the products.

Q) When should the UltraHeat® Tank Heaters be turned "ON"?
When should it be turned "OFF"?

A) The 13.5 VDC power switch for the 13.5 VDC UltraHeat® Tank Heaters should be turned "ON" or the power cord for the 120 VAC UltraHeat® Tank Heaters should be plugged in when the outside temperature approaches freezing 32°F (0°C.) The 13.5 VDC power switch should be turned "OFF" and the power cords unplugged when the outside temperature stays above freezing. All UltraHeat® Tank Heaters are thermostatically controlled, they turn "ON" automatically when the holding tank temperature is 44° F (7° C) and turns "OFF" automatically when the liquid in the holding tank reaches 64°F (18°C.) The UltraHeat® Tank Heater should be turned "OFF" or unplugged when dumping the holding tank.

Another update: They also make a dual powered pad. (120VAC and 13.4VDC) not sure how you select which one to use. Also the 12VDC units pull 10 amps when running (PER PAD) and I have 2 in my unit. The units with a galley tank have 4 pads (one on the galley elbow).

With nothing else on but the tank heaters, my 75 AMP HOUR (as delivered) DC-24 battery would last about 3 hours. Add the furnace and it would not make two hours.

Not an issue while towing for you though since the pads would draw power from the TV. I will need to check this further. Been over a year since I looked at my tank heater paperwork.
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Old 10-13-2010, 06:52 PM   #13
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I don't know the current draw and have no way to measure it. The company insisted I leave their test equipment with them when I retired. We don't dry camp and at home the TT stays plugged in all the time.
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Old 10-13-2010, 06:57 PM   #14
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The Ultra Heat site says 10 Amps DC per pad.
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Old 10-13-2010, 10:40 PM   #15
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ur not going to last very long on the battery. if ur going down the road with them on, i don't believe the circuit from the truck will keep up. i'm not completely sure but i think the circuit from the truck is 20 amp.
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Old 10-14-2010, 08:57 AM   #16
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Quote:
Originally Posted by jimh View Post
ur not going to last very long on the battery. if ur going down the road with them on, i don't believe the circuit from the truck will keep up. i'm not completely sure but i think the circuit from the truck is 20 amp.
I need to check, but I think my GMC Sierra's circuit is 30 amps. It would really be an issue if you were charging the camper battery and more than one pad fired up at the same time.
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