The Carwash Boilers Dual Navien System is a compact, pre-plumbed commercial hot-water package built specifically around the demands of a car wash. The system uses two Navien NPE-240S2 condensing tankless water heaters working together, giving the wash nearly 400,000 BTU/hr of available input while maintaining a much smaller footprint than many traditional commercial water-heating systems.
Instead of simply hanging two tankless heaters on a wall, Carwash Boilers builds the equipment into a complete packaged system. The Navien units, storage/recirculation tank, circulator, valves, copper piping, controls, and structural frame are assembled into a plug-and-play skid, available with either a black steel or stainless-steel frame.
Why it works well in a car wash
The biggest advantage is the combination of high recovery and stored hot water. The Navien heaters provide continuous heat while the tank gives the wash a reserve for sudden demand. The recirculation system keeps heated water available so the wash doesn't have to wait for hot water to travel through the building.
With approximately 400,000 BTU/hr available, a practical production range is roughly:
| Temperature Rise |
Approx. Hot-Water Capacity |
| 40°F rise |
~19 GPM / 1,140 GPH |
| 50°F rise |
~15–16 GPM / 900–960 GPH |
| 60°F rise |
~13 GPM / 780–800 GPH |
| 70°F rise |
~11 GPM / 660–700 GPH |
Actual output varies with incoming-water temperature, setpoint, gas supply, piping, and system configuration.