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Posted by Dick Stetson on August 12, 2009 at 08:43:53:
In Reply to: Re: Cleaning Teledyne Laars Modutherm Boiler posted by Doug Criner on October 10, 2008 at 17:22:03:
This is an older Teledyne Boiler. They were very efficient for their time. Don't know of many of them still out there. Most have been replaced. The biggest problem was a thermostatic gas valve which would lower the main burner flame as the return water to the boiler increased in temperature. These would start to wear out and the boiler would start making alot of noise (making steam).
This is very similar to a pool heater with copper coils. These coils can lime up and cause problems.
To sum up, with the age of the boiler, It would probably be best to replace it. $20,000 sounds pretty excessive though. You could probably replace it with a Slant Fin Bobcat for half the money, depending on the installation requirements.
Viessman High Efficiency boiler is also a good replacement but about $2000 more for the boiler than the bobcat.