Mestek gg120a1nsa11 Gas Unit Heater 120000 Btu/h 82% Eff

Product Description

The MESTEK gg120a1nsa11 is a low-profile gas-fired unit heater rated at 120,000 BTU/h on natural gas, designed for residential and light commercial heating applications. It operates on 115 volts with a single-stage direct spark ignition system and delivers 82% thermal efficiency through an aluminum heat exchanger. The unit is power vented and ships LP-kit compatible, giving installers flexibility for jobsite fuel requirements. A 1/10 HP open drip-proof (ODP) motor drives the blower. Weighing approximately 120 pounds, this heater suits suspended ceiling or overhead mounting in garages, warehouses, shops, and similar spaces where floor space is at a premium.

This unit heater is built for both residential and commercial environments where overhead forced-air heat is the preferred solution. Standard power-vented operation allows conventional venting through an exterior wall or roof. The separate combustion option accommodates tighter building envelopes where indoor air quality or makeup-air requirements demand an isolated combustion air source. Typical installers include licensed HVAC technicians and mechanical contractors working on new construction or replacement heating in garages, service bays, agricultural buildings, and small commercial spaces.

Key Features

• 120,000 BTU/h heating capacity on natural gas
• 82% AFUE efficiency with aluminum heat exchanger
• Single-stage direct spark ignition — no standing pilot
• Power vented; compatible with standard vent or separate combustion configuration
• 1/10 HP ODP blower motor for reliable airflow in dusty environments
• LP conversion kit compatible for propane installations
• Low-profile cabinet designed for overhead or suspended mounting

Compatibility

Designed as an OEM residential and commercial low-profile gas unit heater. Accepts an LP conversion kit for propane fuel operation where natural gas is unavailable.

Installation Notes

Installation must be performed by a licensed HVAC or mechanical contractor in accordance with the International Fuel Gas Code (IFGC) and all applicable local codes. Shut off gas supply and disconnect electrical power before any service work. Vent system sizing and clearances must follow the manufacturer instructions and local authority having jurisdiction requirements. Do not operate the unit without all vent connections fully secured and verified for proper draft.

Technical Specifications

• Heating Capacity: 120,000 BTU/h
• AFUE Efficiency: 82%
• Fuel Type: Natural Gas (LP kit compatible)
• Voltage: 115 volts
• Ignition Type: Direct spark, single-stage
• Heat Exchanger Material: Aluminum
• Blower Motor: 1/10 HP ODP
• Venting: Power vented; standard vent or separate combustion
• Unit Weight: 120 pounds

Standard Information

• Brand: MESTEK
• Manufacturer Part Number: gg120a1nsa11