ProLine® 40-Gallon Ultra-Low Nox Atmospheric Vent Tall Natural Gas Water Heater

Model GUC-40
4.2 out of 5 Customer Rating
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Capacity (Gallons)
Height Classification
UEF
Advanced Options
Limited Tank Warranty
Diameter
  • Delivers 83-gallon first hour rating
  • 40,000 BTU input atmospheric vent design delivers up to 0.64 Uniform Energy Factor
  • Ultra-Low NOX Green Choice® Gas Burner, meets or exceeds emission requirements in California & Utah
Product Details
  • Delivers 83-gallon first hour rating
  • 40,000 BTU input atmospheric vent design delivers up to 0.64 Uniform Energy Factor
  • Ultra-Low NOX Green Choice® Gas Burner, meets or exceeds emission requirements in California & Utah
  • Push-button piezo ignitor makes lighting pilot fast & easy
  • Intelligent electronic gas control provides precise temperature control and LED status indicator
  • Patented Blue Diamond® glass tank lining protects against corrosion
  • DynaClean™ automatic cleaning system protects against sediment build-up
  • Stainless steel Coregard™ anode rod protects against corrosion longer than ordinary anodes
  • Commercial-grade brass drain valve for durable and easy operation
  • 6-year limited tank and parts warranty

  • The ProLine® 40-Gallon Ultra-Low Nox Atmospheric Vent Tall Natural Gas Water Heater delivers an efficient, reliable performance and features an innovative design that protects against accidental ignition of flammable vapors. Featuring a 40-gallon (nominal) tank and a 40,000 BTU gas burner, the GUC-40 Standard Vent delivers a first hour rating of 83 gallons and a recovery rate of 41 gallons per hour. It carries a 6-year limited tank warranty, and meets Ultra-Low NOx emission requirements. Environmentally-friendly insulation and factory-installed heat trap nipples reduce heat loss for maximum energy savings. This ProLine® water heater is designed with A. O. Smith's superior commercial-grade tank protection. Advanced tank features include stainless steel Coregard™ anode rod, Blue Diamond® glass lining and DynaClean™ automatic sediment-cleaning system, all designed to help protect the tank from the corrosive effects of water and extend the life of the water heater. A. O. Smith’s ProLine® water heaters are residential products built to commercial-grade standard and are only available for purchase through professional wholesalers and contractors.

Specifications
Tech Specs
Nominal Gallon Capacity
40 Gallons
Rated Storage Volume
38 Gallons
UEF
0.64
Maximum BTUs
40,000
Power Source
GAS
Limited Tank Warranty
6 Years
Limited Parts Warranty
6 Years
T&P Relief Valve
TRUE
Water Connection Location
TOP
Emissions
Ultra-Low NOx
First Hour Rating
83 Gallons
ASME Certified
No
Blanket Included
No
Destination Country
US
Flue Diameter
4.00
Fuel Source
NATURAL
Installation Type
INDOOR
Application
RESIDENTIAL
Product Tier
ProLine®
Shipping Height 
62
Shipping Length 
19
Shipping Width 
22
Side Loop
No
Dimension & Venting
Type
Water Heater
Height
58.25"
Diameter
18 in."
Shipping Weight
125lbs
Vent Type
Atmospheric Vent
Find a Replacement
Current Product
Option 2
ProLine® 40-Gallon Ultra-Low Nox Atmospheric Vent Tall Natural Gas Water Heater
ProLine® XE Ultra-Low NOx Indoor 180,000 BTU Condensing Natural Gas Tankless Water Heater
GUC-40
ATI-340H
Rebates up to $300 +
Rebates up to $300 +
Nominal Capacity
40 Gallons
Rated Storage Volume
38 Gallons
Diameter
18 in."
Width
17.75"
Depth
21.75"
11.25"
Height
58.25"
23.625"
Shipping Weight
125lbs
70lbs
Power Source
GAS
GAS
Limited Tank Warranty
6 Years
0 Years
Limited Parts Warranty
6 Years
5 Years
T&P Relief Valve
TRUE
Water Connection Location
TOP
BOTTOM
First Hour Rating
83 Gallons
Thermal Efficiency
0%
0%
All Reviews for ProLine® Ultra-Low NOx Atmospheric Vent (450 series)
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