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Converting old cast iron boiler maintaining existing radiation

Have an old boiler with cast iron radiators. Would like to use a low mass boiler, however I fear clogging the heat exchanger. Understand Dan's apprecation of this combination. Are their in-line filters that can be addeded? Any thoughts?

Thanks 2


  • kcopp
    kcopp Member Posts: 4,432
    edited November 2013
  • Steamfitter66
    Steamfitter66 Member Posts: 117
    what I do is

    flush with diluted muriatic acid prior to demo if possible. Then add a strainer on the return side pipping.

    Most larger systems have side stream filters which filter a percentage of the water down around 50 microns or so. I have installed these on Mod con retrofits but that is site evaluated.

    I would highly recommend a Triangle Tube Prestige boiler as it is almost impossible to plug and is as good as anything on the market.

    Make sure you use a company that knows boilers and is not a forced air or plumbing contractor that once in a while puts in a boiler. I've fixed a lot of those.

    A heat loss calculation should be done prior to any contract being signed. If a contractor goes by rule of thumb or seat of pants stay away.

    Ive been doing this for over 25 years and can guess pretty close to what a house will be but I still do a complete load calc every time.

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