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Laars Mascot ST MSTWW199 Wall Hung Condensing Tankless Water Heater

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Price: $1,699.99 w/ FREE SHIPPING
Item Number: MSTWW199
Manufacturer Name: Laars Heating Systems Company
Manufacturer Part No: MSTWW199

Installation Manual

The Mascot ST is a wall mounted tankless water heater packed with features that easily satisfies the hot water needs of the modern home. Within the Mascot ST is an advanced stainless steel condensing heat exchanger that delivers a quick response and exceptional efficiency. When there is a need for hot water, the Mascot ST immediately begins to produce hot water, running for as long as you need it to make sure you never run out of hot water. It’s a very efficient and responsive system that will take care of your family’s hot water needs with years of reliable service.


  • 0.96 Energy Factor: Ultra-High Efficiency
  • 10:1 Modulation: For small to large hot water demands
  • 199,000 BTU/Hr: Ample hot water for the whole family
  • Environmentally Friendly Low NOx Emissions
  • Reliable Stainless Steel Condensing Heat Exchanger
  • Vent up to 100 ft. in PVC, CPV & Polypropylene
The Mascot ST condensing tankless water heater is equipped with the advanced Laars Integrated Control System
  • Easy to use dial and push button input system with large backlit display
  • Functions are clearly displayed for quick set-up and diagnostics
  • Quick access buttons for temperature control and water heater status and functions


Mascot ST Tankless models are powered by an advanced stainless steel condensing heat exchanger using the latest in combustion technology.

  • Hot flue gas is evenly distributed across an array of oval water tubes.
  • The oval tube shape causes turbulent flow and releases stored heat trapped inside the hot flue gases to better transfer heat from the water heater to your home.
  • Self-cleaning, condensate flows down along the tube walls and out through condensate collection system.
  • Uniform heat distribution reduces stress points in the heat exchanger. Combined with erosion–and corrosion–resistant materials, the result is a durable design for a long lifetime of use.

Reliable & Innovative Design

  • High Performance Blower: Blower designed specifically for use with the Laars Mascot ST heat exchanger. Performance curve matches required heat exchanger air flow resulting in ideal air to fuel ratio.
  • Automatic Air Gas Mixer: Combustion control system spans a wide range of efficient and reliable combustion rates.
  • Advanced Condensing Heat Exchanger: Stainless steel water tube construction results in superior performance at an industry leading 0.96 energy factor while minimizing calcium deposits for long life.
  • Mixing Valve: Precision mixing of domestic hot water ensures that the ideal water temperature is delivered throughout your home each and every time.
  • Control Display: Easy–to–use push button and dial interface.
  • Modulating Gas Valve
  • Clean Burning Burner: Pre-mix metal fiber burner uses fuel efficiently and produces ultra-low NOx and CO emissions.
  • Flow Control Valve: Consistent supply of ample hot water is delivered through this advanced modulating flow system.
  • Laars Integrated Control: Dual stage anti-freezing mechanism, Switched-Mode Power Supply (SMPS) design, Built-in gas leak detection (alarm will activate and the unit will shut down if a leak is detected)

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