As buildings age, so do the major central equipment within the building, making it a prime opportunity for a boiler system retrofit. Older systems typically are made up of non-condensing boilers that ...

Boilers equipped with condensing economizers can have an overall efficiency that exceeds 90 percent. A condensing economizer can increase overall heat recovery and steam system efficiency by up to 10 ...

The plume of steam from our neighbour's boiler flue blows over our patio and obscures our windows. Your reply in a recent column to another question about this was that the plume may not be dangerous.