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Converting steam to hot water system?
i would make sure that your boiler is operating as efficiently as possible, before making any such conversion to hot water. you will probably need new piping and rads before you are through moving from steam to hot water.
get a copy of "the lost art of steam heating" from this site, and begin to examine all aspects of the sysytem. unfortunately you can't fire the boiler in the summer, but you can check settings such as pressure, venting etc.
is this 1-pipe or 2? when we put in a new boiler [1,050,000 BTU], and got our pressure down, and main line venting improved, our consumption seems to have dropped by 1/4 judging by past figures from the gas co.
however i would not immediately assume that your old boiler is unuseable simply because of its age. what make is it? also to be looked at would be the boiler control-thermostat or otherwise. a bad location can cause temperature overshoot which of course is wasteful.--nbc