GU81-50T40R - ProLine® Master 50-Gallon Ultra Low NOx Gas Water Heater - 8 Year Warranty

GU81-50T40R - ProLine® Master  50-Gallon Ultra Low NOx Gas Water Heater - 8 Year Warranty Where to Buy

ProLine® Master With their innovative design and commercial-grade components, our ProLine® Master gas water heaters are built for strong, long-lasting performance.


  • 8-year limited Tank warranty, 8-year parts warranty for Residential applications
  • Intelligent Control Logic-The internal microprocessor provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance.
  • Green Choice® Gas Burner -Patented eco-friendly burner design reduces NOx emissions by up to 33% and complies with Low-NOx emission requirements of less than 40 ng/J.
  • Coregard™ Anode Rod - • Our anode rods have a stainless steel core that extends the life of the anode rod allowing superior tank protection far longer than standard anode rods.
  • Blue Diamond® Glass Coating - Provides superior corrosion resistance compared to industry standard glass lining.
  • Ultra-Low NOx complies with requirements in California of less than 10 ng/J NOx Emissions

CSA Design Certified Green Choice Gas-Fired Burner CSA Low Lead ContentComplies with SCAQMD 1146.2 Ultra-Low NOx regulations

Tech Specs

  • Nominal Capacity:
    ?Nominal Capacity is a representative number provided by a manufacturer for comparison purposes. The actual rated storage volume of our water heaters may be found on the product details page on our website.
  • Rated Storage Volume:
    ?Rated Storage Volume is the measured storage volume defined by the Department of Energy.
  • UEF: 0.61
  • Self Cleaning: Yes
  • Limited Warranty Tank: 8
  • Limited Warranty Parts: 8
  • Limited Warranty Labor: 1
  • Max BTUs Input: 40,000
  • Emissions: Ultra-Low NOx
  • Ignition Type: Piezo push button
  • Foam Insulation: Yes
  • Water Connection Location: Top
  • Water Connection Size: 3/4
  • First Hour Recovery (Gallons): 84


  • Height: 57 1/4"
  • Height w/Draft Hood: 62"
  • Diameter: 20"
  • Width: 20"
  • Depth: 20"
  • Vent Size: 3 or 4 "

Technical Documents:

Support Resources: