Can these be used to heat a water bed mattress?

If you’re only looking to keep it from freezing I imagine it’d work fine. Otherwise it turns off way before a comfortable temperature.

Picture shows two, will there be one or two in this order.

Hello, this link are 2 packs package. You will receive 2 pads if you order 1 with $73.99. Thank you for your attention.

Could this be used to warm batteries?

I imagine it could but I do not know what the max output power is. I wouldn't until you are sure of the pads max operating temp and check the battery specs to see it's heat tolerance. Essentially these are just heating pads with a built in on/off sensor. It would warm whatever it is stuck on.

Can you connect this directly to pos/neg battery terminals on a 200Ah 12v auxiliary battery?

That is the intention. However, highly recommended to add the switch pack. At least in an Airstream - which ducts heat to the tanks - you have the option of turning power to them completely off. Also, while your RV is idle with batteries still in place and nothing in your tanks, you can insure they're off and not draining the battery when outside temps go below 42 (when they automatically turn on).

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Facon 7-1/4"x25" 12V RV Holding Tank Heater Pad, Black, Foam, Up to 50 Gallons Fresh/Grey/Black Water, Automatic Thermostat Control, 2 Packs

Facon 7-1/4"x25" 12V RV Holding Tank Heater Pad, Black, Foam, Up to 50 Gallons Fresh/Grey/Black Water, Automatic Thermostat Control, 2 Packs

4.0/5

Product ID: 253377076

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Details

Special features
Lightweight
Material
foam
Brand
Facon
Colour
Black
Item dimensions L x W x H
63.5 x 18.4 x

🔥12V power for efficient heating

🌡️Auto thermostat control at 45°F-68°F

🛠️Self-adhesive foam pad for easy install

Description

❄️ Stay warm, stay mobile — never let winter freeze your adventure!

DUAL PURPOSE HEATING - Perfect for tanks and RV steps—melt snow and prevent slips while protecting your water supply.
RELIABLE WINTER COMPANION - Trusted Facon technology engineered for RVers who refuse to let cold weather slow them down.
EFFORTLESS DIY INSTALLATION - Peel, stick, and wire—no complicated tools or plugs required for a seamless setup.
SMART THERMOSTAT AUTOMATION - Heats only when needed between 45°F and 68°F, saving energy and extending tank life.
FREEZE PROOF YOUR RV EXPERIENCE - Keep your fresh, grey, and black water tanks thawed up to 50 gallons—no more winter worries.

The Facon 7-1/4"x25" 12V RV Holding Tank Heater Pad is a dual-pack solution designed to protect up to 50-gallon RV water tanks and steps from freezing. Featuring a built-in thermostat that activates between 45°F and 68°F, this self-adhesive foam pad ensures energy-efficient, automatic heating. Easy to install with a simple 2-wire design, it’s the essential winter accessory for RV, camper, trailer, and marine enthusiasts seeking reliable freeze protection.