Dewinterization-2024 Forest Glen Wildwood with a Tankless Water Heater

[AliStew]

New to all of this and confused with all the different advice.
We are trying to dewinterize our 2024 Forest Glen Wildwood Heritage Glen 36FL. We have a Suburban Tankless water heater. We have filled our fresh water tank. Ran cold water, hot water, and flushed the toilets till all ran clear-no pink. Now, we’ve read to drain your water heater, drain valve, water heater line…. But can’t find any information to find exactly what this is and how to do it. What exactly do we need to do for our tankless water heater so that when we add the bleach mixture to be sure it dies not go into our tankless water heater?
Do we need to leave the solution in the fresh water tank and lines for 4 hours, 6 hours, 12 hours?
Overall, the process seems easy but the steps aren’t clear on what a tankless water heater needs.

 

[bikendan]

Moved thread from the TT/5th Wheel section's Rockwood sub-forum to the Plumbing, Water Systems and Fixtures sub-forum since the OP's questions are specific to that sub-forum and because the OP owns a Wildwood, not a Rockwood.

 

[llr2800]

If you are sure you have a tankless I don't believe those instructions apply. Many, probably most suburban water heaters are tank type.
For length of time for bleach solution I have seen 1-48 hours suggested. I typically do 3-5 hours but have left it overnight if starting later in the day.

 

[5picker]

Tankless water heaters use different methods of winterization than do tank type.
Same goes for dewinterization. It is often good to go right to the source of the manufacturer for instructions.
While you told us it was a Suburban tankless water heater, you never told us the model number.

Here is a link to a Suburban Tankless water heater manual. Pay attention to page 8 where it talks about winterizing and turning a red valve. We don't know how/what you did to winterize, so hopefully this helps.

Suburban Tankless Water Heater Manual