MRCOOL Natural Gas & LP Gas Tankless Water Heater (199K BTU)

The MRCOOL® Tankless Water Heater is built to deliver endless, on-demand hot water with powerful performance and high efficiency. Unlike traditional tank systems, this unit heats water instantly as it flows, eliminating standby heat loss and ensuring you never run out of hot water.

Designed for whole-home use, this system can handle multiple bathrooms and appliances at once while maintaining consistent temperature and performance. With advanced gas-powered heating and smart flow control, it provides reliable comfort while reducing energy costs.

Whether you're upgrading your home or replacing an outdated tank, this system offers modern efficiency, powerful output, and long-term reliability.

• Endless hot water (never runs out)
• High efficiency = lower energy bills
• Powers multiple bathrooms at once
• Compact wall-mounted design
• Advanced temperature control

Performance

• Heating Capacity: 199,000 BTU
• Flow Rate: Up to ~8.45 GPM (whole-home capable)
• Water Output: ~32 L/min
• Efficiency: ~92% UEF (high efficiency)

• Fuel Type: Natural Gas (also available in propane version)
• Power Supply: 120V
• Temperature Range: 95°F – 140°F
• Water Pressure Range: 70–140 PSI

Connections

• Gas Inlet: ¾" NPT
• Cold Water Inlet: ¾" NPT
• Hot Water Outlet: ¾" NPT
• Vent Size: 2"–3" flue

Build & Features

• Corrosion-resistant internal components
• Advanced flow sensor activation
• Heat exchanger design for fast heating
• Compact wall-mounted design

Warranty

• 15-Year Heat Exchanger
• 5-Year Parts
• 5-Year Labor

ankless systems heat water only when you need it, instead of storing it in a tank. When water flow is detected, the system instantly activates and heats water as it passes through the unit.

This results in:

• Continuous hot water
• Higher efficiency
• No standby heat loss