Steamhead question

Timco

http://www.heatinghelp.com/newsletter.cfm?Id=125

This link takes me to your article of circ sizing but the graphic covers much of the beginning text. Any way to see what's under the graphic?

Thanks again,

Tim

brucewo1b

Think this is whats missing

When servicing old hot-water heating systems that originally circulated by gravity, but now use circulating pumps, I began to notice a lot of oversized circulators. In some cases, the circulator was so severely oversized that the boiler could hardly get any heat out to the radiators. The water couldn't pick up much heat in the boiler or shed it in the radiators because it was moving so fast. There is very little resistance in the large pipes of a gravity system, so the