I currently have a propane Heater that was shared by the pool and the spa and it decided to that a **** so I'm in the market for a new one. I've decided since know one ever uses the pool when it would be required to be heated, I'm going to size it for the spa only. We are only talking a 500-gal spa so I'm thinking we only need 100,000 BTU unit. My question is, can anyone recommend a good unit? My interest is more on the quality side of things apposed to the cost side. I control my pool with a Pentair intellitouch automation system so it would need to be able to be controlled through the automation system.