My hotwater heater is barely heating water. The propane flames are reduced from when it was new. Can one take the burner apart and unclog it? Is it another problem? thanks
That appears to be a Suburban water heater (with SIT control). It probably needs the orifice cleaned or the burner tube (which contains the orifice) replaced.
Possible help...
Suburban Water Heater manual (see p 7... Erratic main burner flame sputtering yellow-- clean orifice with alcohol and compressed air)
A few years ago I cleaned the burner orifice on my water heater, using a welding torch cleaner. Can't remember exactly, but I think I removed the gas supply tube and went in thru there.