The VD2A series of the Vitorond 200 commercial oil-/gas-fired sectional cast-iron boiler
from Viessmann modulates boiler water temperatures to closely match system output to actual demand.
A 30-year-old cast-iron boiler
may be running OK, but its efficiency is poor.
The systems analysed: a radiator system with cast-iron boiler
; a radiator system with a condensing boiler and a floor--heating system with a condensing boiler.
Shively circled to the back of one building, weighing the value of the cast-iron boiler
I retreated to the lounge trying to keep warm and do some work - while ignoring anything that sounded like a heavy cast-iron boiler
crashing through the ceiling.
Two gas-fired GN4 N-14 cast-iron boilers
were selected to provide all the warm air heating for the entire 250,000[ft.sup.2] building which is rented as office space to various clients, including a call centre that operates 24 hours a day.
It had to be collected from the nearest stream or well before being put into cast-iron boilers
, kettles or zinc buckets which would be suspended over an open fire in the kitchen.