Quick install Diesel Heater. Heats 14,500 gallon pool from 79 to 85 in 11 hours. Keeps pool temp maintained at night and keeps pool comfortable in cloudy cool weather. Just disconnect your pump discharge line and connect it to the heater and connect the heater hose to the pool water jet and ypur install is done. No hard lines or gas lines needed. Just plug in with an extension cord. This system has bin boosted so the fuel gauge time reading will not give an accurate indication of time left in the tank. The burners are turned up to crank out more power than the label on the burner depicts. That is why it may say it has only 7 hours left. In the tank but you really only have about 3 hours due to the higher fuel consumption.