RELIANCE WATER HEATERS RUF-100-199-*E* 4** (BTH-199* 4**)
RELIANCE WATER HEATERS RUF-100-199-*E* 4** (BTH-199* 4**) 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 4481291, certified 2025-08-13). EPA publishes these rated values for the listing: Type Gas Storage; Fuel Gas,Propane; Vent type Power Direct Vent; Storage volume (gal) 100; Tank height (in) 62.9; Height to vent (in) 11; Tank diameter (in) 24; Vent size (in) 3; Vent size 2 (in) 4; Input rate (thousand Btu/h) 199.9. 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 Storage |
| Vent type | Power Direct Vent |
| Standby loss | 1000 |
| Vent size (in) | 3 |
| Tank height (in) | 62.9 |
| Vent size 2 (in) | 4 |
| Tank diameter (in) | 24 |
| Height to vent (in) | 11 |
| Storage volume (gal) | 100 |
| Thermal efficiency TE | 0.96 |
| Input rate (thousand Btu/h) | 199.9 |
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.