Camplux Elite 65,000 BTU RV Tankless Water Heater 2.64 GPM-BlackEndless Hot Water65,000 BTU high power output, max water flow 3. 9 GPM, provides endless hot water for showering and dishwashing at the same time Universal RV Water Heaters ReplacementGreat replacement for Suburban and Atwood 4 6 gallon, Girard, FOGATTI, and Furrion tankless RV water heaters. Cut out size 12. 8"12. 8", comes with a 15. 2"15. 2" RV door Safety & ReliabilityCSA & NSF certified, built in pressure relief valve, ensures both secure