Identify water heater

the suburban SW3-P, SW4-P, SW6-P, SW6-PE, SW6PR, and SW6-PER all use the SIT 610 gas valve so it is most likely one of those.  to know exactly which one you have to look for the number written on that silver tag stuck to the bottom right side of the frame.  I can almost make it out in your picture but the lower right bolt is in the way of what comes after the SW

Most K-Z trailers from around 2010 used either a Suburban or Atwood/Dometic water heater. You should be able to find a metal tag on the outside access panel of the heater (usually on the driver’s side of the trailer) with the brand and model number — that’ll tell you exactly what you’re dealing with. Once you have that, the manuals are all available online as free PDFs.

A couple of quick checks that often solve the “not working” issue:

• Gas side: Make sure the propane tank is on, lines are purged (stove burners lit first helps), and the water heater switch is actually turned on inside the trailer. You should hear it click/try to ignite.
• Electric side: If it’s a combo unit, there’s usually a separate rocker switch outside on the heater itself (behind the access panel). Many people miss that one.
• Reset buttons: Look for small rubber reset buttons on the unit — they can trip if the heater has overheated or been run dry.
• Water in the tank: Always confirm the tank is full before testing — running it empty can damage the element or tank.

If you grab the brand/model off the heater door, I can point you directly to the right manual.

see that silver sticker on the side in the bottom right hand corner, you have to get the brand and model number off that and post it so we can better help you, I tried zooming in, but couldn't make it out

Thank you. Any idea what the electrical device in the upper left corner is and does?

It is a SitGroup 610 AC3 Waterheater. Click the link below to download the manual.

https://share.google/pOqX3aN1RmczUxenL