What does FVIR mean and how does it work?
How does the installation of an FVIR-compliant water heater differ, if at all, from that of a non-FVIR unit?
What makes some FVIR systems different than others? For more information, call 1-800-HEATER3.
In related news, Rheem Water Heaters has introduced a pocket-size reference manual for its new Rheem Guardian System[tm], a line of residential gas-fired, atmospheric water heaters designed to meet the new ANSI Standard governing FVIR water heaters. The new standard became effective July 1 for residential gas-fired water heaters with storage capacities of 30-, 40-, or 50-gallons.