Why buy more heater than you need, when the MiniMax® 100 heater is sized specifically for your spa or small above ground pool? The environmentally friendly gas fired smaller heater, the MiniMax 100 heater is a compact, self-contained unit with an output of 100,000 BTUs, perfect for heating spas and small above ground pools of up to a 900-gallon capacity. MiniMax 100 is easy to install and maintain. It can be connected to schedule 40 CPVC or ABS pipe and has a built-in top. Reliable direct-spark ignition (DSI) system is available in propane or natural gas versions. The MiniMax 100 heater is the efficient and economical way to keep your spa or small pool at the optimum temperature for comfort.