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 1021.
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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 1021.
  • y_2026, m_8, d_26, h_8
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.48
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  • co_hasreviews, tv_171, tr_850
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What to Expect from this Model
modal-clock
tooltip
Number of minutes you can enjoy a shower before running out of hot water. Assumes a 2.1 GPM flow rate
25.5 minutes
single shower length
modal-frame
tooltip
Number of back-to-back showers you can take without running out of hot water. Assumes a 2.1 GPM flow rate and an 8 minute shower length
3.2 showers
back-to-back
modal-frame
tooltip
Number of showers you can take at the same time without running out of hot water. Assumes a 2.1 GPM flow rate and an 8 minute shower length
2.4 showers
at the same time
modal-tank-capacity
tooltip
Biggest tub this water heater will fill without running out of hot water. Assumes a 5.0 GPM flow rate, and a 67% fill level
61 gallons
max tub size
modal-cost
tooltip
The estimated annual cost to operate this water heater in your location
$306/year
est. energy cost
Based on location results for Columbus, OH 43215
modal-edit
Edit Location / Advanced Settings
Specifications
Tech Specs
Nominal Gallon Capacity
40 Gallons
Rated Storage Volume
38.2 Gallons
UEF
0.58
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 Reviews My water heater quit and I call B&L Plumbing to install the new water heater. The State ProLine water heater was my preference due to the good reviews
Date published: 2026-08-20
Rated 5 out of 5 by from Solid Reputation over the decades. Unit was purchased by the plumber and delivered by him. I have learned it is better to let plumber buy the water heater through his own plumbing supply house that provides a better quality and warranty as opposed to Big Retail stores that aren't the same.
Date published: 2026-08-15
Rated 5 out of 5 by from Best quality Our very respected contractor said this was hands down the best water heater to buy, Say no more!
Date published: 2026-08-12
Rated 5 out of 5 by from The heater meets our expectations. We are pleased with the hot water heater and the ease of installation including the clear instruction provided.
Date published: 2026-08-09
Rated 5 out of 5 by from Works great. Very good quality. Easily installed. Works great.
Date published: 2026-07-31
Rated 5 out of 5 by from Replaced 5 yr old wh hard water area old device failed due to hard water.
Date published: 2026-07-02
Rated 5 out of 5 by from Water Heater Good purchase and nice water heater for what my household needs
Date published: 2026-06-27
Rated 5 out of 5 by from Safe, Efficient Product Delivery of hot water is faster and heat level is stronger; there was an immediate improvement noted. I am confident we now have a safer more efficient water heater for all our family needs.
Date published: 2026-06-18
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