I have Purex Triton Minimax 350 heater which wasn't used much last season. I noticed it was slow to heat last season, the few times we used it. Now it won't get past 94* even after a couple hours run time.
My thoughts are to check and clean the jets to make sure they are burning correctly, and I suspect the heat exchanger may be partially blocked due to calcium buildup. My water is not particularly hard, but I would bet the heat exchanger has neven been cleaned in it's 11 year lifespan.
I've never done either of these things so any tips will be appreciated. I will try to find the manual online, and I will do some more searching here to see what others have done.
I think I'd need to remove the exchanger and dip it into a strongish MA solution to clean the scale from inside it? And you'd want a nice blue flame from the jets, similar to what I look for on my grill?