MRCOOL® Liquid Propane Tankless Water Heater
SKU MHWH199NCLU
Customize it — compatible add-ons only
Universally compatible tools and care items — maintenance kit, coil cleaner, install tools.
Sizing Help
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Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.
Description
MRCOOL® Liquid Propane Tankless Water Heater
What's in the Box
Here's what you'll receive with your order
Electric Water Heater
Storage tank water heater
Heating Elements
High-efficiency electric heating elements
Temperature & Pressure Relief Valve
Safety valve included
Installation Manual
Plumbing and electrical guide
Key Specifications
120V
Voltage
199000BTU
Heating Capacity
MRCOOL® Liquid Propane Tankless Water Heater — Model Details
What this specific model is sized for, how it installs, how it performs, and what it costs to run.
Room & Space Coverage — 199,000 BTU
The MRCOOL® Liquid Propane Tankless Water Heater delivers 199,000 BTU of cooling and heating capacity, sized for spaces 2,000+ sq ft in standard 8-ft ceiling rooms with average insulation. At this capacity the unit is typically used for open-plan main floors, large garages, pole barns, finished basements, and small commercial bays. For homes with vaulted ceilings, heavy sun exposure, or poor insulation, plan on ~20% more BTU per square foot than the nominal coverage.
Power & Electrical Requirements
Power requirement: 120V 60Hz (standard US 120V household outlet).
Install Difficulty — Professional Install
This is a professionally-installed condenser that requires a licensed HVAC technician with EPA 608 certification. The tech will pull a vacuum on the line set to 500 microns, pressure-test with nitrogen, release the factory charge, and commission per MrCool's startup procedure. Budget 1 full day for install on a single-zone system.
Warranty & Certifications
Manufacturer warranty: 5 year parts on parts.
Product Details
With the MRCOOL® Liquid Propane Tankless Water Heater, you can enjoy hot water much longer and consistently than usually experienced with traditional water heaters. This tankless water heater features a high volume and flow rate, high efficiency, and is capable of accommodating multiple home appliances and up to four bathrooms. This heater is space-saving and compact while being environmentally friendly as well. Advanced engineering was used to create the corrosion resistant stainless steel unit, which increases the lifespan of the heater. With four times the corrosion resistance of copper, this feature ensures you have clean water in and clean water out. The many high tech features that come with this heater include an electronic thermostatic PCB and an EDM BLDC variable-speed fan. Featuring an eco-friendly premixed burner, you can expect higher efficiency, a higher turn-down ratio, and safer anti-flashback burner. This also creates a reduction in NOx emissions. The smart self-adapting temperature regulation ensures a comfortable shower experience with accurate temperature regulation. The anti-freeze protection keeps the pipeline water higher than 40°F. The large touch screen display keeps you and your plumber informed about the heater’s operation during maintenance. This unit must be installed by a professional. Feel protected by the 15-year warranty on the heat exchanger, as well as a 5-year parts warranty and a 5-year labor warranty.
Specifications
| Heating Capacity | 199,000 BTU |
| Voltage | 120 V |
Features
- Meets SCAQMD Standards
- UNSPSC: 52141700
- Not mobile home compatible
- Min Temp: 95 F / Max Temp: 140 F
- Wattage: 150 W (+114 W when anti-freeze module is on)
- Maximum Gallons per Minute: 8.45g/min
- Flow Rate @ 35°F Rise (gallons/min): 11.12
- Flow Rate @ 45°F Rise (gallons/min): 8.45
- Flow Rate @ 55°F Rise (gallons/min): 6.8
- Flow Rate @ 65°F Rise (gallons/min): 5.8
Frequently Asked Questions
Everything you need to know about this product
What size room will the MRCOOL® Liquid Propane Tankless Water Heater cool?
Do I need a licensed HVAC installer?
What electrical circuit do I need for installation?
How fast does HVACZAR ship this unit?
What if it arrives damaged or I change my mind?
What is the warranty on the MRCOOL® Liquid Propane Tankless Water Heater?
How long does shipping take?
What size room does 199,000 BTU cover?
Do you offer returns?
How can I pay?
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Ships Nationwide — Shop by State
We deliver the MRCOOL® Liquid Propane Tankless Water Heater to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.





