Description
Never run out of hot water. The MRCOOL MHWH199NCLU is an indoor liquid-propane tankless heater that supplies continuous hot water for the whole house, up to four bathrooms, without a storage tank.
You only heat water when a tap opens. That is how it reaches a 0.95 Uniform Energy Factor and ENERGY STAR certification. Inside: a lead-free stainless steel heat exchanger, a premixed low-NOx burner, a variable-speed fan, and built-in freeze protection.
Key features
- 199,000 BTU/h maximum input for high-demand homes
- Up to four bathrooms, depending on inlet temperature and simultaneous use
- 11.1 GPM at a 34°F rise, 8.5 GPM at 45°F, 5.7 GPM at 67°F
- 0.95 UEF, ENERGY STAR certified
- Lead-free primary and secondary stainless steel heat exchanger
- Touchscreen for operation, diagnostics, and maintenance
- Category IV power direct vent: 2-inch, 3-inch, or concentric
- Indoor wall mount: 26.8 × 17.3 × 10.6 in., 66.1 lb
Hot water performance
| Temperature rise | Flow rate |
|---|---|
| 34°F | 11.1 GPM |
| 45°F | 8.5 GPM |
| 67°F | 5.7 GPM |
Actual flow varies with inlet-water temperature, set temperature, gas supply, water pressure, and simultaneous demand.
Specifications
| Brand | MRCOOL |
|---|---|
| Model / MPN | MHWH199NCLU |
| UPC | 810035930339 |
| Fuel type | Liquid propane (factory configured; do not field convert) |
| Installation | Indoor, wall mounted. Licensed professional required. |
| Maximum input | 199,000 BTU/h (58.3 kW) |
| Minimum input | 20,000 BTU/h (5.9 kW) |
| Uniform Energy Factor | 0.95 |
| Heat exchanger | Lead-free primary and secondary stainless steel |
| Temperature range | 95°F–140°F (factory setting 120°F) |
| Minimum actuation flow | 0.5 GPM |
| Inlet gas pressure | 8–13 in. WC |
| Manifold pressure | −0.5 in. WC |
| Water pressure | 15–150 PSI |
| Gas connection | 3/4-inch NPT |
| Water connections | 3/4-inch NPT inlet and outlet |
| Condensate drain | 1/2-inch NPT |
| Venting | 2-inch, 3-inch, or concentric PVC, CPVC, or approved polypropylene |
| Venting type | Category IV power direct vent |
| Ignition | Direct electric ignition |
| Power | 120V AC, 60 Hz; 150 W (plus 114 W when freeze protection runs); 1.3 A max |
| Certifications | CSA listed, ENERGY STAR |
| Color | White |
| Product dimensions | 26.8 H × 17.3 W × 10.6 D in. (connectors excluded) |
| Net weight | 66.1 lb |
| Shipping dimensions | 33.22 H × 20.27 W × 13.74 D in. |
| Shipping weight | 74 lb |
| Proposition 65 | Yes |
What's included
- MRCOOL MHWH199NCLU liquid propane tankless water heater
- Gas shutoff valve
- Upper and lower wall-mount brackets and mounting screw kit
- Two bird screens and 3-inch flue-flow limiting ring
- Inlet valve assembly, O-rings, igniter gasket, sandpaper, and fixing kit
- Installation and operation documentation
Pressure-relief valve, service valves, flush kit, venting, and job-site materials are not included. Confirm the full install package with your licensed installer.
Warranty
Manufacturer coverage includes a 15-year limited heat-exchanger warranty, 5-year parts warranty, and 5-year limited labor warranty for the original end user, subject to the terms in the warranty certificate.
Product documents
Installation & Operation Manual (English)
Product Brochure & Specification Sheet
Professional installation is required. Confirm local gas, venting, electrical, condensate, plumbing, and code requirements before purchase. This appliance is factory configured for liquid propane and must not be field converted.
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