Velocity Boiler Works PHX400V-O (Phantom-XL)
Velocity Boiler Works PHX400V-O (Phantom-XL) appears in the U.S. EPA ENERGY STAR "Certified Commercial Water Heaters" dataset, which lists products whose manufacturers have certified them to the program's specification (record 4480968, certified 2025-07-31). EPA publishes these rated values for the listing: Type Gas Tankless; Fuel Gas,Propane; Vent type Direct Vent; Storage volume (gal) 4; Vent size (in) 4; Input rate (thousand Btu/h) 399; Thermal efficiency TE 0.98. The listing records ENERGY STAR certification and the rated values the manufacturer reported to EPA. It is not a determination that any building, installation or design complies with a code.
Specifications
| Fuel | Gas,Propane |
| Type | Gas Tankless |
| Vent type | Direct Vent |
| Vent size (in) | 4 |
| Storage volume (gal) | 4 |
| Thermal efficiency TE | 0.98 |
| Input rate (thousand Btu/h) | 399 |
Certifications & Standards
Sustainability
Code sections
Sections of the model codes that address this type of product. A link opens the code library at the chapter that holds the section. It points to the code; it does not say this model meets it.
- IECC 2021 C404.2Service water-heating equipment performance efficiency
IECC 2021 C404.2 governs the efficiency of commercial water-heating equipment (Table C404.2). This is the section for this product type, not a check of this model against it.
What this link does and does not claim
Asserted: this is an ENERGY STAR certified commercial water heater, and C404.2 is the energy code section that addresses the efficiency of commercial water-heating equipment (Table C404.2). Not asserted: that this model meets any table value in C404.2, or that any building using it complies.