HVACZAR - Authorized MrCool Dealer
MRCOOL® Natural Gas Tankless Water Heater
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Pro Install

MRCOOL® Natural Gas Tankless Water Heater

SKU MHWH199NCNU

199,000 BTU120
4.8 (5 reviews)3 verified buyers
$1,529.00
Pay over time withAffirmaffirmKlarnaKlarna— see your options at checkout.
In Stock — Ships within 1-3 days

Customize it — compatible add-ons only

Universally compatible tools and care items — maintenance kit, coil cleaner, install tools.

5 year service warranty · Covers 2,000+ sq ft
Ships nationwide · exact freight at checkout · Ships in 1-3 business days
30-day returns on unopened products · See policy
Secure checkout:Visa · Mastercard · Amex · Discover

Sizing Help

Not sure if 199K BTU is right for your space?

Proper sizing prevents short-cycling, high bills, and premature failure. Our sizing tool takes 60 seconds.

Match My SpaceOr call (657) 582-0899

Resources

Brochures & Manuals

BrochureInstall ManualWarrantyInstall Manual (FR)Warranty (FR)

Description

MRCOOL® Natural Gas 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

2 Years compressor warranty
Compressor: 2 Years warrantyParts: 1 Year warranty

Key Specifications

120V

Voltage

199000BTU

Heating Capacity

MRCOOL® Natural Gas 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® Natural Gas 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

Unlike traditional water heaters, the MRCOOL® Natural Gas Tankless Water Heater provides neverending hot water to up to four bathrooms and multiple home appliances simultaneously. With a high volume and flow rate, this tankless heater is highly efficient while still being environmentally friendly. This compact and space-saving heater has a much longer lifespan thanks to the stainless steel, corrosion resistant engineering. This design has four times the corrosion resistance of copper and is lead free. One of the many high tech features of this unit is the electronic thermostatic PCB, which provides intelligent temperature control and gas flow that is automatically controlled. The EDM BLDC variable-speed fan provides stable combustion along with a smooth air flow transition. The combustion chamber is surrounded by water tubes making it a thermal insulator also. The environmentally-friendly premixed burner gives a reduction of NOx emissions, lowers the flame temperature, and reduces port-loading. You can experience the most comfortable shower experience thanks to the self-adapting temperature regulation. A large touch-screen display provides helpful information to you and your plumber about the heater’s operation. This unit must be installed by a professional and offers a 15-year heat exchanger warranty, a 5-year parts warranty, and a 5-year labor warranty. This MrCool® Natural Gas Tankless Water Heater will replace your old water heater and provide efficiency and effectiveness.

Specifications

Heating Capacity199,000 BTU
Voltage120 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® Natural Gas Tankless Water Heater cool?

At 199,000 BTU this unit is sized for rooms 2,000+ sq ft under standard 8-ft ceilings with average insulation. Add 10–20% for sun-exposed rooms, poorly insulated spaces, or ceilings above 9 ft.

Do I need a licensed HVAC installer?

Yes — this unit is professionally-installed. The installer needs EPA 608 certification to handle the refrigerant, plus standard HVAC tools (vacuum pump, manifold gauges, nitrogen kit). Expect a one-day install on a single-zone system, more on multi-zone.

What electrical circuit do I need for installation?

120V dedicated circuit with the disconnect within sight of the outdoor unit per NEC 440.14. An electrician will size the breaker based on the minimum circuit ampacity shown on the nameplate. Budget $400–$900 for a new dedicated 240V circuit if one isn't already present.

How fast does HVACZAR ship this unit?

Shipping is calculated at checkout from the order weight, and you see the exact charge before paying. In-stock SKUs leave the warehouse within 1–3 business days. Transit time is 3–7 business days via truck freight (with liftgate delivery) for outdoor units and UPS Ground for accessories. Tracking is emailed at pickup.

What if it arrives damaged or I change my mind?

Inspect the unit before signing for freight delivery. If there is visible damage, note it on the delivery receipt and refuse the shipment — we ship a replacement at no cost. Unopened and unused units can be returned within 30 days for a refund less outbound shipping.

What is the warranty on the MRCOOL® Natural Gas Tankless Water Heater?

The MRCOOL® Natural Gas Tankless Water Heater comes with a 5 year service manufacturer warranty when purchased from HVACZAR, an authorized MrCool dealer. Register your unit after purchase to activate full warranty coverage.

How long does shipping take?

Shipping is calculated at checkout from the order weight. Most MrCool systems ship within 1-3 business days and arrive in 3-7 business days via FedEx, UPS, or truck freight with liftgate delivery.

What size room does 199,000 BTU cover?

A 199,000 BTU unit is sized for rooms 2,000+ sq ft. Proper sizing depends on ceiling height, insulation, climate zone, and window exposure. Use our system finder for a precise recommendation.

Do you offer returns?

Yes. HVACZAR offers a 30-day return policy on unopened, unused products in original packaging. Contact us to initiate a return and receive a return authorization number.

How can I pay?

We accept all major credit cards (Visa, Mastercard, American Express, Discover) via Stripe secure checkout. All transactions are encrypted and protected.

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Ships Nationwide — Shop by State

We deliver the MRCOOL® Natural Gas Tankless Water Heater to all 50 states via FedEx, UPS, and truck freight. Each state page lists local rebate programs and utility incentives.

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