I am wondering if you can convert the lp or propane gas to natural gas on a bosch tankless hotwater heater. I am guessing it has a different orfice and regulator
to do this you switch it from natural gas to propane remove this answer, a tautology, no help at all
Change out the gas flow orifice size to propane and adjust the gas valve.
Yes, there is a kit you can get to replace the orifices of the natural gas.
buy a new fireplace.
It would be very difficult to convert a solid heater into a gas.
You can't convert natural gas to propane because natural gas is methane and propane is what it says it is. Given that, there are Compressed Natural Gas cars, and if you get a natural gas compressor you can use it in a car.
how do we get our gas range converted back to natural gas
YOU cannot - you need to call a gas fitter.
switch the jets over to natural gas. get them at most hardware stores.
http://okeefe-merritt.com/pages/parts/partso%27keefe.html Go to this website and look for a propane to natural gas regulator. They sell them for $42.50.
Get a certified technician to work on gas. He will have to change the orifice, possibly the gas valve.
I would not recommend natural gas bbqing. It would make more sense to continue to use propane, or even charcoal. Natural gas may introduce carcinogens into your food.