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2019 Gas Boiler Prices & Costs - Natural Gas, High . 2019-9-5 · A gas boiler is similar to a gas furnace in that it is a system that uses natural gas -- like propane-- to heat your home. However, a furnace provides heat by using air, while a boiler uses water. eBay. Buy Gas Water Boilers and get the best deals at the lowest prices on eBay