Hello! We are looking to replace our existing Hayward H-Series Gas heater (400000 BTU). It is overheating for whatever reason and is looking pretty burnt out on the inside. The pool guy thinks it may be getting too much gas. He feels that it really is not worth repairing as it is over 8 years old and pretty damaged. We use it for heating our spa attached to the pool. We do not heat the pool itself as we don't have a cover. I would like some advice as to which gas heaters are the best, and most suitable for a salt water chlorinated pool. And which one is the best value for the money and most efficient. Also, is solar heat something that we should look into? I don't know if it matters or not, but we have a Hayward pump with Goldline Aqualogic chlorination system. Would love any comments....