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I have a 2018 like yours. The last time this water was installed in the 2019 model year. In 2020 they changed to the newer system.

Because of the Alde design, you can't do any harm running it with or without water. The electric elements are in the glycol.

Another thing to keep an eye on is the outside shower. Make sure both knobs are off. If you leave them on, the hot and cold will mix through the valve assembly. All faucets in the trailer will have medium temperature water.

Warning: Sarcasm follows….

You got an answer from a "Customer Experience Manager" and a quick google search shows his background is in sales and marketing, including a stint as an account rep for Kellogs.

To be fair a total of three valves need to be changed to switch between winterizing and camping. He is correct that the valves to and from the Alde need to be open to have hot water, but the bypass valve needs to be closed.

@pthomas745, @Bayliss, @MuttonChops, @Grumpy_G

This is my first post on this forum. I am impressed by the time and dedication you all put into replying. 👏

@Bayliss, yes, I know using the city water connection is better, we were just trying things out and our campsite for this weekend doesn’t have water hookups. And yes, we opened the yellow valve. But you may still be right that it’s only residual water. Thanks again, I will keep you guys posted.

@Voyager , Sorry, but you are incorrect as the ByPass-Valve Must Be Closed for camping season to get real Hot Water for more than a few seconds.

Assuming the first picture you posted is your TAB:

Considering your TAB is a yr-2019 . . . the most common reason for no hot water is the TMV mixing value is clogged, jammed and needs to be serviced. Every few years the TMV should be cleaned and lubricated Something That Is Not Covered in any of the nuCamp manuals.

This forum has a document in the Resources Section outlining how to service the TMV

LK550 Mixing Valve Operation and Servicing

Check if you have hot water at the outdoor shower with the bypass valve closed. That will tell if there's an issue upstream of the bypass valve.

@Voyager , I agree with @MuttonChops. I think nuCamp Customer Support may be misinterpreting what you are experiencing.

I may be misunderstanding what is going on as well, BUT, before you do any adjusting to the mixing valve, is it possible that your Alde hot water tank is not filled (because the bypass valve remaining open is not allowing sufficient water to flow through the cold water line to fill the tank?).

To find out, close the bypass valve, but leave all the other valves set as depicted in the photo posted by @MuttonChops. Then, connect a fresh water hose (with pressure regulator attached) to the fresh water inlet on the side of the trailer. Turn on the hose to energize/pressurize the water lines and fill the Alde tank. You don't necessarily need to turn the hose on full blast, at least initially, but sufficiently enough to pressurize the water lines.

To allow the water to be pulled into the Alde tank, open the cold and hot water faucets at your kitchen sink, just a bit, to bleed/pull the air out of the water lines, which should in turn allow the water to start flowing through the lines to the faucet.

Gradually further open the cold and/or hot water valves at the sink to increase the amount of air and water flow as the water lines fully pressurize. Once the "sputtering" stops, and you have a constant/smooth flow of water running through the faucet, your Alde tank should be filled. You will probably need to open the shower and toilet valves too to get water flowing through those lines as well.

If all goes well, and your Alde tank is full and the water lines pressurized, it should just be a matter of heating the water in the Alde tank to see if hot water starts flowing at a good temp.