Free residential service call with any repair during normal business hours

CSI Mechanical

   (704) 600-6267

Serving Shelby, NC Metro Since 2010



  • Technical Specifications


    Home Size

    Southern climate: 3-3.5 baths
    Northern climate: 2 baths

    Indoor Unit Dimensions

    23.6” (H) x 13.8” (W) x 9.4” (D)


    58 lbs.

    Gas Consumption

    Min. 16,000 btuh
    Max. 199,900 btuh

    (NG & LP)

    Natural Gas/Propane

    Capacity Range

    0.5 – 9.8 GPM

    Uniform Energy Factor

    0.83 (NG) | 0.88 (LP)

    Temperature Settings

    100-140° F (in 5° F Intervals) (9 options)

  • Models and Accessories

    Model Number and Description

    Model (Natural Gas)

    GQ-2857WX-FFA US NG

    Model (Liquid Propane)

    GQ-2857WX-FFA US LP



With more power than any tankless water heater in its class, the NR981 series is ideal for mid-size homes with up to 4 showers. Built-in features include safety lock-out, freeze protection, and high elevation adjustment. PVC CANNOT be used for venting.