Select® 40-Gallon Gas Water Heater

Model GSX-40-BCS 400
4.1 out of 5 Customer Rating
Select® 40-Gallon Gas Water Heater is rated 4.7 out of 5 by 1009.
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Capacity (Gallons)
Limited Tank Warranty
Height Classification
Fuel Source
Advanced Options
First Hour Rating
Maximum BTU's
Side Loop
Diameter
Select® 40-Gallon Gas Water Heater
Model GSX-40-BCS 400
4.1 out of 5 Customer Rating
Select® 40-Gallon Gas Water Heater is rated 4.7 out of 5 by 1009.
  • y_2026, m_5, d_2, h_14
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.43
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  • co_hasreviews, tv_169, tr_840
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Specifications
Tech Specs
Nominal Gallon Capacity
40 Gallons
Rated Storage Volume
38.2 Gallons
Maximum BTUs
40,000
Power Source
GAS
Limited Tank Warranty
10 Years
Limited Parts Warranty
10 Years
T&P Relief Valve
Yes
Water Connection Location
TOP
Water Connection Size
0.75"
First Hour Rating
67 Gallons
ASME Certified
No
Blanket Included
No
Destination Country
US
Flue Diameter
4.00
Fuel Source
NATURAL
Height to T&P
41.25
Ignition Type
Pilot with Piezo Igniter
Installation Type
INDOOR
Application
RESIDENTIAL
Shipping Height 
51.31
Shipping Length 
26.13
Shipping Width 
23.13
Side Loop
No
Dimension & Venting
Type
Water Heater
Height
47.75"
Diameter
22"
Shipping Weight
135 lbs
Vent Type
Atmospheric Vent
Height to Gas Valve
12.5"
Maintenance & Troubleshooting
Maintenance

Residential Series Atmospheric Vent Lighting the Pilot

Troubleshooting

Residential Series Atmospheric Vent Draft Test

Residential Series Atmospheric Vent No Hot Water

Residential Series Atmospheric Vent Status Code 1 Flash

Residential Series Atmospheric Vent Status Code 2 Flash

Residential Series Atmospheric Vent Status Code 4 Flash

Residential Series Atmospheric Vent Status Code 5 Flash

Residential Series Atmospheric Vent Status Code 7 Flash

Residential Series Atmospheric Vent Status Code 8 Flash

Residential Series Atmospheric Vent Status Code Light Continuous

Marketing Videos
Residential Series Atmospheric Vent Application and Installation
Residential Series Atmospheric Vent Features and Benefits
Residential Series Atmospheric Vent How It Works
Product Comparison
Current Product
Option 2
Select® 40-Gallon Gas Water Heater
Adapt® SC Standard Condensing 180,000 BTU Natural Gas Tankless Water Heater
GSX-40-BCS
STM-180M-N
current Product
option 1
Rebates up to $300 +
Rebates up to $300 +
Nominal Capacity
40 Gallons
1 Gallons
Rated Storage Volume
38.2 Gallons
Diameter
22"
Width
17.12"
Depth
25.5"
11.85"
Height
47.75"
32.46"
Shipping Weight
135lbs
93lbs
Power Source
GAS
GAS
Limited Tank Warranty
10 Years
0 Years
Limited Parts Warranty
10 Years
5 Years
T&P Relief Valve
Yes
Water Connection Location
TOP
BOTTOM
Water Connection Size
0.75"
0.75"
First Hour Rating
67 Gallons
Thermal Efficiency
0%
0%
All Reviews for ProLine® Atmospheric Vent (400 series)
Rated 5 out of 5 by from Great water heater Heats water fast and efficient. Would recommend so to have 10 year warranty.
Date published: 2026-04-26
Rated 5 out of 5 by from So far, so good Needed to replace a 65 gallon. Able to find comparable solution with 50 gallon plus a booster. Could not tell the difference.
Date published: 2026-04-26
Rated 5 out of 5 by from Performs silently and proficiently. My water heater was installed in August 2024. I neglected to register the item but am doing so now. It has preformed well with no apparent problems the year and one half it has been installed.
Date published: 2026-04-23
Rated 5 out of 5 by from Great features The system heats water quickly and maintains a consistent temperature, even during back-to-back showers or when running multiple appliances. The installation process was smooth and professional thanks to Joseph Simpson & Son Plumbing & Heating in Southern Maryland. Overall, I'm very satisfied with this water heater. It's reliable, efficient, and provides great performance for everyday use. I would definitely recommend investing in a new water heater if your current one is outdated or struggling to keep up.
Date published: 2026-03-18
Rated 5 out of 5 by from Great features I just bought the State Pro-Line unit today, however, so far so good.
Date published: 2026-03-16
Rated 5 out of 5 by from Satisfied Second one purchased. Lasted 10 yrs. Never had a problem.
Date published: 2026-03-10
Rated 5 out of 5 by from New gas water heater Super Happy with my new water heater! Joslin's plumbing Installed it and did an excellent job. Took a super hot bath and could not be happier!
Date published: 2026-01-28
Rated 5 out of 5 by from Well made quality water heater. Super excited about the water heater. Well made quality water heater.
Date published: 2026-01-23
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