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TomW 03-20-2020 03:36 PM

Step-by-step Vintage Furnace Replacement
My '67 Overlander's furnace, with routine inspection, treated us well over the last 16 years. But it was time to replace it this year with its modern day equivalent. I'm not sure how I will handle not lighting another pilot light!

In an effort to add to the Forum's knowledge base, you can read about the high-points here:


lawrell 11-29-2021 01:04 PM

Hi, Was your old furnace a NT-22 A? What is the new furnace? I have a 71' Overlander that I'm replumbing and many other upgrades and had to remove the furnace and surround plenum box to get access to the fresh water tank. Your's looks just like mine but not able to tell by the pic if it's the same size. Thank you in advance.

TomW 11-29-2021 01:42 PM


Originally Posted by lawrell (Post 2558539)
Hi, Was your old furnace a NT-22 A? What is the new furnace? ...


The new one is a NT30SP. It appeared to be the best match. Works great! My wife really enjoys having the potty heated by the bath vent.


lawrell 11-29-2021 02:22 PM

thank you. I'll order the NT-30SP and use your pics as a guide. my old heater box looks just like yours so I'm hoping mine will finish up like yours.

thanks again.

PizzaChop 11-29-2021 04:30 PM

I think I replaced the furnace in my 72 Overlander with an NT30 before I sold it but here is a pic of the NT30 in the 73 Sovereign I have now. It was pretty close to the NT32 as I recall.

I might have some more pics of installation somewhere but it was a long time ago.

Tom, good to see you're still around. We've been inactive for a few years but with all the older kids growing up, we're ready to camp again. Added a gray water tank to the Sovereign, replaced all the rear bunks with a full size bed, and are wrapping up the bathroom remodel to be ready to go by new year.

Been a long time!

lawrell 11-29-2021 04:55 PM

thank you PizzaChop Ron

TomW 11-30-2021 04:41 AM

Great to hear from you Ron! I thought of you the other day when Kim and I were at Unicoi State Park as it looks relatively close to you. Glad to read you are getting ready to hit the road again.

Safe travels!

Sneakinup 11-30-2021 05:49 AM

Sorry Tom, but I got rid of the original furnace from my 77 Sovereign. I know you like to tinker with prehistoric artifacts. :lol:

TomW 11-30-2021 06:16 AM

Too funny, Barry... but accurate!


PizzaChop 11-30-2021 06:56 AM

Houghton AC/Heat pump installation
Actually, we replaced the Coleman Mach with a Houghton AC/heatpump this fall and are very happy with it. It works down into the 30s and is quieter and more consistent (so Brenda says) than the furnace.

We did have to rely on the furnace at NC Alumalina in October for the first night as the 30a breaker at site was on the fritz (and so happy we had the furnace for back up).

But with the Houghton, we can save our propane.

(Probably won't last as long as Coleman, which is still operational, as nothing new ever seems to.)

Probably always a good idea to have a propane furnace as a back up and given the danger of heat exchanger leaks from pinhole rust, best to ditch the original if over 20 years old (IMO).

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