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Poppy and his crew restored this vapor system in a 1916 rowhouse in Columbia Heights, DC. Only two of the graduated inlet valves remained and neither worked.
The Peerless boiler is fairly new. While not perfect, it is piped better than most we see. We added a skim port and installed a Vapor-Stat set to 8 oz.
There were no steam traps as the original system relied on low pressure and graduated inlet valves to keep live steam out of the returns.