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Commercial water heatersENERGY STAR certified

Velocity Boiler Works PHX400V-O

399 kBtu/h gas tankless water heater.

Input rate

399 kBtu/h

Storage

4 gal

Thermal efficiency

0.98

Fuel

Gas, Propane

Of 207 certified gas tankless commercial water heaters, 9 have a higher thermal efficiency than the PHX400V-O (0.98).

Maker
Velocity Boiler Works
Model
PHX400V-O
Type
Gas Tankless
Fuel
Gas, Propane
Storage
4 gal
Thermal efficiency
0.98
Input rate
399 kBtu/h
Vent
Direct Vent
On the market since
Aug 2025
ENERGY STAR certified
31 Jul 2025

Source: ENERGY STAR certified commercial water heaters dataset, US EPA, record 4480968, data build 2026-09-29. Figures are as the maker certified them. How we use this data.

Other makers

Machines comparable to the PHX400V-O

Certified commercial water heaters from other makers, same color class, within 20% of its speed.

ModelTypeFuelStorageInput rate
Trinity LX400WHGas TanklessGas, Propane2 gal399 kBtu/h
Lochinvar AWH0400N SERIES 1**Gas TanklessGas4 gal399 kBtu/h
Lochinvar AWH0400L SERIES 1**Gas TanklessPropane4 gal399 kBtu/h
HTP ELX-400FVWHGas TanklessGas, Propane3 gal399 kBtu/h
A. O. Smith PWH0400NP*Gas TanklessGas, Propane4 gal399 kBtu/h
Laars NT2V0399Gas TanklessGas4 gal399 kBtu/h

Velocity Boiler Works

More Velocity Boiler Works commercial water heaters

ModelTypeFuelStorageInput rate
PHXW400Gas TanklessGas, Propane4 gal399 kBtu/h
PHXW500Gas TanklessGas, Propane5 gal500 kBtu/h
PHXW650Gas TanklessGas, Propane6 gal650 kBtu/h
PHXW800Gas TanklessGas, Propane7 gal800 kBtu/h
PHXW1000LGas TanklessGas, Propane9 gal999 kBtu/h
PHX1000C-OGas TanklessGas, Propane9 gal999 kBtu/h
PHX800C-OGas TanklessGas, Propane7 gal800 kBtu/h
PHX400C-OGas TanklessGas, Propane4 gal399 kBtu/h

All Velocity Boiler Works commercial water heaters