firewood guy
ArboristSite Operative
If you have a propane water heater, you will have to buy a new water heater designed for natural gas. They are NOT interchangable. That may be another cost to consider.
Roger
There are units that are interchangeable. It involves not only an orifice (jet) change, but also a pressure regulator change @ the appliance as well. Any Lowe's , HD. or a local plumbing/HVAC supply house can turn you on to water heaters that are dual-fuel. They have been on the market for decades. I've gone back and forth on one small house that was built in the late 50's depending on the renter and the price of Nat/ LPG and the renters credit rating!!