Tarm info needed.

JerseyWreckDiver · Jun 5, 2011

I've only seen a few of these over the years. This one has no data tag of any kind and I'm trying to figure out how old it is. One of the maint. stickers on it has a date back to 1984 so I know it is at least that old, but I think it's older. The serial number on the Carlin burner is 41689 which I think indicates it was manufactured in 1968 and would be consistent with when I think the house was built.

Any help from someone that knows these boilers would be appreciated.

webbie · Jun 5, 2011

Model OT 35 from the OT series.
These were sold mostly in the 1978-1984 period, although we sold a few right up until about 1990.

a manual and brochure can be found at the links here:
http://www.woodboilers.com/discontinued-boiler-information.aspx

Our wiki entry:
https://www.hearth.com/econtent/index.php/wiki/HS_Tarm_Boilers

webbie · Jun 5, 2011

To answer your question, it is probably no older than 1980....or right around then!
They may have used a Carlin burner from an existing oil unit, etc.

JerseyWreckDiver · Jun 5, 2011

Awsome, Thank you.

Yah, I figured the Carlin might predate the boiler.

Any idea as to a general/average life expectancy on these boilers? I'm guessing it's more than the 25-30 you expect out of a typical oil fired boiler but I don't have much experience with these.

Thanks again.

webbie · Jun 6, 2011

Boilers can last longer - it has more to do with whether the inside was exposed to new water (oxygen) and whether there were any leaks on the outside which rusted the steel. If you remove the large DHW coil dome (after draining boiler to that level, of course!) and then looking at the thickness of the boiler wall.

Stickler · Jun 12, 2011

I bought this exact boiler new in 1978. Have cycled 3 oil burners for various reasons. It is in perfect condition and I have heated my house and DHW with both oil and wood every year, 24-7. I just installed a new gasket for the DHW coil and refreshed the threaded pipe fittings. Also put in a 550 gallon storage tank (unpressurized), now burning wood all year. I can't say enough about the longevity and the quality of this unit. Not a gasser but very efficient.

coolidge · Jun 13, 2011

There should be a tag under the top cover and insulation.

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