descaling a nautilus on demand water heater iw60

[biomedical247]

what do I need to descale this model on my 2020 alpine 3700fl? the heater is not heating up to the correct temp.

[martybmw]

I had a similar issue (2021 3700FL) and finally was able to reset the Temp to 130F which helped a lot. It helps to keep the recycling part on while using hot water. Funny thing even thought the On Demand unit is in the front compartment I get hot water in the rear bathroom sinks faster than the kitchen which is right next to the unit.

[Mikendebbie]

The Suburban IW60 owners manual says we are supposed to descale once every year - however I have not added the appropriate plumbing fittings and valves to do the descale. I have the diagram of the bi-pass that needs to be installed out in the RV. I need to find it and post it here. I don’t know if the other manufacturers recommend a descale or not…so this applies to Suburban models.

Basically you need two 5 gal buckets…one for a descale solution ( vinegar + water??), an inline 120 volt portable pump and some garden hose to hook up to the descale bipass loop you installed. Turn the valves (you installed) to isolate the descale loop (so that the descale solution will not run thru the RV plumbing). Turn the pump on and circulate the solution thru the innards of the water heater. You can find descale “kits” online for less than $200. I plan to buy the pieces and parts + pump at Home Depot for less. Some kits feature 12 volt pumps but I will go the 120 volt route. I need to figure out how to make my descale connections easy to access for the once-a-year cleaning operation. For what’s worth - tankless systems for the S&B are supposed to be descaled annually - but generally the kit is easily accessed and installed.

There is a current thread on the Montana Owners Forum about on demand water heaters. I posted the info below this morning. You can check the water temps on your unit for comparison.

[Mikendebbie]

I found the instructions from Airxcel/Suburban to install a descale kit - scanned it - see below with a few of my notes...