We added a switch (from a hardware store) to our 2016 Classic. It is the type that reduces to a dribble so that you don't forget to turn off the water. It did not work as well as in our previous Airstream. The culprit is the stock water heater that is 6-gallon, but works like a 9-gallon by super heating the water and then mixing it with cold. When water flow was reduced to a trickle the mixing valve still tried to adjust the temperature. When you went back to full flow, you got a slug of inappropriate (way too hot) temperature water. The longer you were on trickle, the longer the potentially scalding temperature lasted, but it would occur a few seconds after going back to full flow.
Basically, the water heater ruled out the use of the trickle button, so we are stuck doing on-off at the main handle. I wish we just had a normal 6-gallon water heater so the trickle button would work. We have never needed more that 6 gallons in any of our prior Airstreams.
It took a while to diagnose the cause of this issue, but you can simulate the effect at the kitchen sink by getting a good flow of warm to hot water going, then reduce it to a trickle for maybe 30 seconds, and the go back to full flow and wait for the too hot temperature shift that will occur several seconds later.
I can only assume that this scald issue is why Airstream did not include the trickle button on 2015 and 2016 Classics. Apparently this is a non-issue on the 2017 Classics with the Alde system.
Wally Byam Caravan Club International Historian
Vintage Airstream Club Historian