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Posted by jtown on January 29, 2004 at 07:43:05:
Cold start is to limit the loss of heat, primarily up the chimney, after the boiler shuts off for long periods. An application with intermittent occupancy would especially benefit. A modern building with low heat loss and high thermal mass (masonry, etc. inside) would also need heat less often. It should be done only with a boiler designed for the thermal stresses. A system with a stack damper or power venter would not gain as much. A recirc line should be used to keep the boiler water hot enough to limit condensation in the breech or stack, since the circulating water has cooled. A gas boiler with a step in the firing rate would be good, to warm the boiler slower.