If you don't need expertise, there's Amazon. They're very good about returns should a problem arise. The biggest items I've burchased from them (for my pool) are salt cells. They hit the bank for under $500, and a 400,000btu heater is going to be WAY over that. That seems like a huge one, or maybe mine is undersized. My spa is heated by an 80k propane heater.
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