Hearth & Home 812-3500 3-Position Switch Type_Thermostat Pairing one new cartridge with

Pairing one new cartridge with older ones leaves the fresh filter doing more than its share and gives you uneven filtration across the set

it's already in the acrylic

Care & Maintenance

stirring with a wooden stick until the solution turns dark red and is totally dissolved

eats through seals

Hearth & Home 812-3500 3-Position Switch Type_Thermostat Pairing one new cartridge withHearth & Home 812 3500 3 Position Switch Overview Upgrade your fireplace control system with the reliable Hearth & Home 812 3500 3 Position Switcha versatile and user friendly solution designed specifically for controlling gas fireplace blowers and fan kits. Engineered for compatibility with a wide range of Hearth & Home Technologies (HHT) fireplace models, this durable switch offers three distinct operating modes: Manual On, Off, and Thermostat Auto.