can a spa heater that uses natural gas be changed to use propane?

Answer 1

In order to answer this question one would need to know the make and model number of the appliance as well as possibly the manufacturer and model number of the gas control valve. The answers that some have posted here of simply changing orifices is absolutely incorrect. Those answering the question with a positive yes, or no must have some clairvoyant capabilities that would certainly make them a valuable asset to the Psychic Friends Network, perhaps their talent could be better used there. True orifice’s can be sized for anything, but some gas control valves are dedicated to one fuel, hence non-convertible without complete replacement of the control valve.

Call your local HVAC contractor, or propane supplier, give them the make and model number from the data plate on your unit. They will be able to tell you if your unit is convertible from one fuel to another. If a conversion kit is in fact available, it’s not a job you want to attempt yourself. The conversion kit itself should cost under $100 and the labor for the actual conversion should be in the neighborhood of $100, depending on your location.

Answer 2

Yes. The only difference between the two from the factory is the gas valve inside and the orifices in the burner tray. I imagine this is likely a hayward 125,000 btu heater as they seem to be the most widely used for spas.
I'm not sure it would be cost effective for you. While the actual conversion of the unit would cost between 300 - 400 dollars (125 for the gas valve, 160 minimum for the tray plus labour) , you'll have to run a new gas line as well, not to mention the tank. It'll boil down to how far a run you need to do from the tank and if the propane company is renting you the tank or you have to buy outright. Think about it. A brand new one is gonna be less than 900 bucks, tops and I have no idea how long you've had that one. The firebrick may be crumbling or the bottom rotted out, not to mention the heat exchanger will most certainly corroded somewhat. That retofitted heater may not last long enough to make it worthwhile.
Odd though, that you are going that route. natural gas is usually cheaper in most areas, than propane.

Answer 3

Sure, it's possible, but may not be cost effective. Natural gas is less expensive than propane to consume, not subject to running out while in use. Propane is delivered to the burners at a higher pressure than natural gas, approx 11" water column. Natural gas is fired at approx 4.5" so the control needs to be replaced with one designed for propane. Then the pilot and burner orifices need to be down sized. Again, another expense to get a conversion kit from the maker, unless you have "peen and drill experience". How old is the unit to convert? How much wear and tear has it had? it may be more cost effective to purchase a new propane model. Then there's the fire codes.......can you have a large propane tank on your property? Ask your propane company how large a storage/supply tank do you need to run a 400mbtu pool heater about 4 to 6 hours a day per month in the "pool season"? And the plumbing cost from tank to heater. It's possible, but, I doubt if it's practical.

Answer 4

The only legal and safe way to do it is if the manufacturer offers a conversion kit that would change the orifice. If not, then you MUST purchase a new heater. Don't try the incorrect fuel, as the different gasses are different concentrates, and you could have a major problem.
Good Luck!

Answer 5

yes just change the jets

Answer 6

Ist. It will cancel the wrty. 2nd. orfses may be changed. 3rd. fire breaks out-------------lose your home because you went around the way to save a buck and it will cancel your HOUSE INSURANCE!