tankless water heater
Our new travel trailer has a tankless water heater. Our first trip out was with full hookups and the shower worked great for a continuous running hot water shower. Problem: most times we dry camp. I...
Forum Discussion
schoonod wrote:
thanks for the responses. I'll have to get back tomorrow on the brand in my trailer as I am away from the trailer right now. Not sure how the check valve would work as the on/off button on the shower head would work as a check valve (from my way of thinking). The insulation sounds worth a try -- I'll check tonight how hard it will be to add the insulation. I can easily get into the back area of the heater unit.
The on-off valve at the head doesn't work as a check valve because the water can flow either direction through the mixing valves.
The problem isn't the water cooling off in 30 seconds (at least with mine). The problem is the water flows backwards through the mixing valve when the water is suddenly turned off. This is because of the spike in pressure on the cold side (WH absorbs spike on hot side). This pushes the cold backward through to the hot side. In a house this is often heard as water hammer. When this happens you get a couple of seconds of cold water from the hot side as well as the cold.
Check valves in the hot supply close to the mixing valves helps a lot.
