【Happy RV life】: In plateau areas with an altitude of 10,000 feet, the RV Water Heater can still operate smoothly and efficiently. Staged combustion technology can effectively control water temperature and prevent overheating. It also helps you save gas while traveling 【Replaced All RV Water Heaters】: This RV water heater is universal for all RV Water Heaters. The opening is 12.8 x 12.8 inches and the door is 15 x 15 inches. It can replace to Atwood's 6 gallons tank water heaters, as well as Girard and Furrion's tankless water heaters. If you previously used a 10 gallons tank water heater, it would need to be retrofitted with an 18 x 18 inches door 【Continuous Hot Water】With 55,000 BTU of power, it can produce a maximum of 3.5 GPM of hot water. Compared to tanked water heaters, don't need to waste 20-30 minutes waiting for hot water, so you can enjoy hot water anytimewhereas our hot water supply lasts over 40 minutes 【Don't Need To Wait Anymore】: Tankless water heaters are better than tanked water heaters for continuous showering of multiple people. You don't need to wait anymore, so you can enjoy hot water at all times. It uses propane for heating, so there is no need to worry about running out of power in your caravan 【Safety & Reliability】: The product has multiple protection features such as a built-in forced exhaust fan on top, stable combustion, automatic gas shut-off for accidental flame failure and anti-freeze. when the outdoor temperature drops below freezing the unit will automatically heat the water system till it is 48℉ then the unit will stop 【Anti-freeze Tips】: The automatic anti freeze system shuts down when power and gas are off. Drain the water tank promptly to prevent freezing and cracking rv tankless water heater propane