HouseWarmer Slim-Profile Direct-Vent Wall Heater with Built-In Blower - 18,000 BTU, Natural Gas, Model# HWDV181BDVN Mounts on any outside/exterior wall from 4 1/2in.-12in. thick Thermocouple safety valve Heater requires no electricity (electricity required for blower) 115V, 0.4 Amp blower has 4-ft. electric cord for a standard wall outlet Easy to install