I do not know how this stove is operated at all. As children my brothers and i had no interest to learn from our father what was needed to convert over from the furnace to this stove to take over heating the house and water. We also didn’t learn what was needed to do when power went out so the pressure didn’t build up and blow. Anyway i am looking to sell to someone who would know how to disconnect this stove from my furnace or i will pay a company to do so and add that price to the price i sell the stove for. I have no idea how old this is but i would guess around 40+ years. Looking to sell for $850 or best offer