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I will be replacing a 10 year old Pentair Minimax NT TSI 250 (nat gas) w/DDTC heater in Houston TX area on a 18K gallon inground pool with spa. We have had numerous problems over the years and I'm tired of repairing. Blower rusted out AGAIN and core is very rusty so that will need replacing soon. I don't want to put more money into it at this point. We don't usually heat the pool with it but I want it to work for the spa when I want to use it. What brand and model do you recommend and why?