For a continuous hot water solution at home without the footprint of a traditional tank, a tankless water heater can provide a compact alternative. The MRCOOL MHWH199NCLU is a liquid propane tankless water heater designed for high-volume hot water delivery and capable of accommodating multiple home appliances and up to four bathrooms. Its compact, space-saving design makes the equipment practical where available installation space is an important consideration.
The heater provides a 92% Uniform Energy Factor (UEF) and multiple listed flow rates based on temperature rise. The flow rate is 11.12 gallons per minute at a 35°F rise, 8.45 GPM at a 45°F rise, 6.8 GPM at a 55°F rise, and 5.8 GPM at a 65°F rise. The unit also operates within a listed pressure range of 7–140 PSI. The corrosion resistant stainless steel construction is designed to provide four times the corrosion resistance of copper.
The MRCOOL liquid propane tankless water heater includes freeze protection that keeps pipeline water higher than 40°F. An eco-friendly premixed burner is also included which provides a higher turn-down ratio and safer anti-flashback burner operation while reducing NOx emissions.
For temperature management, smart self-adapting temperature regulation provides accurate temperature regulation, while the electronic thermostatic PCB supports the heater’s control system. A large touchscreen display keeps users and plumbers informed about the heater’s operation during maintenance.
A homeowner shared: “We wanted a heater that can handle a higher hot water demand without taking up much space. This tankless design offers that combination.”
The design provides a compact, space-saving configuration, while the listed flow rates support high-volume hot water delivery. Smart self-adapting temperature regulation also helps maintain accurate temperature control during operation.
The water heater combines liquid propane operation, high-volume flow, efficiency, and freeze protection in a tankless configuration. The MRCOOL water heater’s temperature regulation, and maintenance-focused display provide practical characteristics for a whole-home hot water solution.
Product Highlights
| Feature |
Benefit |
| High-Volume Hot Water Delivery |
The listed flow rates provide multiple reference points for evaluating hot water delivery at different temperature rises. |
| Smart Temperature Regulation |
Self adapting temperature regulation supports accurate temperature control during operation. |
| Corrosion-Resistant Stainless Steel Construction |
Provides four times the corrosion resistance of copper according to the supplied product information. |
| Premixed Burner Technology |
Provides a higher turn-down ratio and safer anti-flashback burner operation while reducing NOx emissions. |
| Freeze Protection |
Helps keep pipeline water above 40°F to provide freeze protection. |
| Compact Space Saving Design |
Provides a tankless configuration designed to save space compared with the supplied traditional water-heater description. |
| Multi Appliance & Bathroom Support |
The heater is capable of accommodating multiple home appliances and up to four bathrooms. |
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