Heated RV Drinking Water Hose

Sounds like a failed heater hose.
I made my own using the EasyHeat product electrical taped to the water hose, and then cheap foam pipe insulation over that. Worked in -20*F, but I also left a little bit on each end of the hose to wrap the trailer connection and the water spigot.

I don't doubt that the Camco hose is a good product, and should have been fine, you need to swap it out for another one.

That's for that info, I probably need to run water more often to keep from freezing also.

Usually only cold weather camp over Christmas in the Des Moines IA area, which is usually 3-5 days.

If the hose did not freeze in the first 36 hours, Pre warming the hose before hook up would not have helped.

I think there might be a good chance the hose bib or the connection to the TT is what froze up. Heated hose won't help much if either or both ends can freeze.

We used Ace Hardware heat tapes and pipe insolation to protect our hoses for many years. buy as other have said you must protect the connections

I wrapped a regular water grade hose with aluminum tape from Walmart. I then taped pipe heat tape from Home Depot to the hose using electrical tape. The aluminum tape distributes the heat more evenly along the hose. I have never had any problems. Works better than that special made expensive electrical hose. I normally carry an extra short length of heat tape and wrap the fauset and pipe coming out of the ground.

We used a heated hose last year temps to the mid-teens at night. Had to wrap the faucet with insulation and my basement is heated never had a problem.

There are heat pads that can be attached to the water tank. There are similar units for the pipes and waste tank valves. That may be a better direction to follow.

It is also possible to run hot water into the tank by adding a hose from the water heater to the fresh water tank. Control the flow with an electric valve using a thermostat on the side of the water tank.

I only run the hose to fill the heated holding tank. I roll up the hose and store inside the heated trailer until I need it again .

When you have your heated hose hooked up and you experience a freeze-up. Check the brass connections at each end by unscrewing the hose. Check to see if the hydrant is frozen or your trailer connector inlet is frozen.
Test/thaw using a hair dryer. If all is good, I would then suspect the unit you bought as being faulty .

as suggested : The alum foil wrap then heated using heat tape is a good idea if you do not have a heated holding tank.

Sometimes the temp sensor is located near the plug. If the plug is in a warm area the sensor will not detect the cold temp outside.

I would also be suspicious of the hydrant freezeing.

An easy check would be to coil your heated hose in a bucket outside and when it has chilled, plug it in outside. It should be a bit warm in a few minutes.

Some of the newer heat tapes use temperature sensing wire and do not have a separate temp sensor.