Hi, I'm guessing so and hoping so because when this one craps out (10+ years old now) it'll be getting a 50 as a replacement.

Heya! Saw your post on your 150L 1.8kW Rheem HWS. I was intrigued so went searching for smaller, and see what you mean. A few 50L units but all 3.6kW...
So could you swap out the 3.6kW for a 1.8kW element...??? Seems to be a wide range of the latter available as 'spare parts'..??