Bosch ProTankless; GWH 425 EF Gas Tankless Water Heater

Bosch ProTankless™ GWH 425 EF Gas Tankless Water Heater

Perfect for situations that require sidewall venting.

The Bosch ProTankless GWH 425 EF features a built-in power vent, an electronic ignition and no standing pilot. This unit is ideal for residential use when the installation calls for horizontal venting. And remember, going tankless means never running out of hot water again!

Electronic Ignition - plugs into 120V (no standing pilot)
Venting: 4" single-wall stainless or galvanied. Built-in Power Vent
NOTE: For Massachusetts Residences considering installing the AQ1 with their Bosch Tankless Water Heater, please consult with Bosch or your licensed contractor in regards to venting regulations.
Up to 130,000 Btu/h
For several pages of information about the advantages tankless "on demand" water heaters, visit our Bosch Help Center.
Energy Saving Chart
National Listings and Approvals
Frequently Asked Questions

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*Bosch ProTankless™* GWH 425 EF Tankless Water Heater** Natural Gas SKU: GWH-425-EF-N	$715.00
*Bosch ProTankless™* GWH 425 EF Tankless Water Heater** Propane SKU: GWH-425-EF-L	$715.00

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Bosch Tankless Water Heater GWH 425 EF Brochure (635 KB Adobe PDF)
Troubleshooting Guide
Bosch Tankless Water Heater GWH 425 EF Installation Manual (875 KB Adobe PDF)
Bosch Tankless Water Heater GWH 425 EF Parts Guide (245 KB Adobe PDF)

Technical Specifications
Power Input	NG: 28,000 - 130,000 Btu LP: 28,000 - 125,000 Btu
Minimum Flow Rate to Activate	0.5 gallons per minute (gpm)
Flow Rates	90° F rise / 2.3 gpm 75° F rise / 2.7 gpm 65° F rise / 3.3 gpm 55° F rise / 3.8 gpm 45° F rise / 4.6 gpm
Energy Factor	NG: .78 LP: .81
Thermal Efficiency	NG: 80% LP: 82%
Dimensions	29¾"h x 18¼'w x 8¾”d
Weight	44 lbs.
Ignition	Electric
Accessories	Horizontal Vent Terminator - FXHOOD (FXHOOD required)
Modulating Gas Valve	Yes
Life Expectancy	20+ years
Installation Specifications
Gas Connection	½" Male NPT
Water Connection	½" Male NPT
NG Gas Pressure LP Gas Pressure	Minimum: 7" WC Maximum: 14 " WC Minimum: 11" WC Maximum: 14" WC
Water Pressure	Minimum: 18 PSI Maximum: 150 PSI
Electrical Supply	120 volts/1.2 amps (plugs in)
Vent Size	4" (single-wall stainless or galvanized)

NOTE: Not approved for use in mobile homes, boats, or RVs. Specifications and product information subject to change without notice.

Information Source: Bosch Water Heating

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