Looking for a proper Nat gas to propane conversion kit

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scythe944

scythe944

Member
Mar 3, 2025
5
Delta, PA
Hi all, I've recently procured a used Raypak Pool heater from Marketplace. I currently have a Raypak P-R265A-EP heater installed that is no longer functional, but had been converted to propane.

Unfortunately, I don't live in an area with access to Natural gas, so I only have Propane as an option.

The model that I have is: P-R406A-EN-C. It's a big unit.

The serial number makes me think it was manufactured in 2016 and has had a recent firebox replacement. For the life of me, I can't seem to find any conversion kits from NAT gas to Propane.

I'm wondering if anyone could help point me in the right direction on where to find a conversion kit for this particular model, or maybe I can just swap parts from my old one. The old one's gas valve is still functional I believe, but the screen doesn't show anything from sun damage and I can't see what is wrong with it. Please let me know if I should include any more information that is missing from my post and thank you for any assistance that you can provide.

Alternatively, if anyone knows of any professionals in my area (Delta, PA) that are trustworthy and could help assist me with getting this installed in the next few months, I'd appreciate that too.
 

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Suggest contacting InyoPools to see what they have to say.

Inyo Pools: Your Destination for Pool Equipment & Parts - INYOPools.com

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@InyoRob

Maybe @1poolman1 knows
 
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proavia said:
Suggest contacting InyoPools to see what they have to say.

Inyo Pools: Your Destination for Pool Equipment & Parts - INYOPools.com

Discover a vast selection of high-quality pool supplies, equipment, and accessories at Inyo Pools. From pumps to filters, heaters to cleaners, pool accessories to hard to find parts. Over 70,000 products available. Backed by 100k 5-Star customer reviews, hassle-free returns, expert advice and...
www.inyopools.com www.inyopools.com
@InyoRob
Click to expand...
Thank you, I'll give them a try.
 
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scythe944 said:
Oh wow, I didn't know I'd need to get the whole burner tray. Dang, that might be expensive. Oh well, I guess it's still cheaper than a whole new heater. Thanks very much for the information, I'll start trying to price and find one!
Click to expand...
You can do the job with all new propane burner orifices ($6 - $20 each, need 27), a new propane main valve (Honeywell aftermarket with propane conversion +/-$150.00), a new pilot burner with the propane orifice installed (its in the kit $30 - $40, 002003F), and breaking off a tab on the circuit board to tell the control you are using propane so that it locks out after a failed ignition as a safety measure (this is very important, the tab is at the edge and marked). A lot of work and expense. The burners themselves don't change. If you don't change all of those items the heater will literally burn itself up. The tray for propane, complete, is about $1300.00.
 
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The burners are the same for Natural and Propane and for different sizes except for the number.

The orifices are different for Natural vs. Propane and by elevation and number.

Burner Orifice #57* (0-1999 ft elevation) 350083F/27.

Combination Valve - Propane. IID 004306F.

The Pilot looks the same except for the orifice.

Pilot Orifice Propane. IID .012 004308F.

(27) 350083F. Burner Orifice #57* (0-1999 ft elevation)

(1) 004306F. Combination Valve - Propane. IID

(1) 004308F. Pilot Orifice Propane. IID .012




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Gas Pressure Regulator.

The gas pressure regulator is preset at 4.0 in. WC for natural gas, and 10.5 in. WC. for propane gas.

The pressure at the gas valve, taken with a manometer, should be about 4.0 in. WC natural gas and 10.5 in. WC propane
gas.

I think that the #57 propane orifice hole should be 0.043" in diameter.

You can check when you get the new orifices.

The Natural gas orifices look like a 0.0700" diameter hole, so about 1.63 times bigger.

If you were going from a smaller hole to a bigger hole, you might be able to drill out the smaller hole, but you are going from larger to smaller.

12,916 x 27 = 348,732 btu/hr.

#57 seems a little bit small for a 400,000 btu/hr propane heater at 10.5" w.c.

It looks like a #56 would be a better choice.

15,104 x 27 = 407,808 btu/hr.

In any case, go with what the manufacturer specifies.
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