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My mother lives in the Boston area and has gas boiler, steam radiators.
Recently, she had a steam expert replace a leaking radiator fitting. The cost was very reasonable as every other plumber wanted to replace the radiator for way more.
When the steam repair guy was there he said her steam supply pipes were too narrow and would upgrade to larger diameter pipes for a reasonable cost.
Assuming this guy is truthful, how much efficiency is gained with this modification? Heat portion of her gas bill is about $ per year.