Most of us don't think about the size of our boiler until we are either cold and the boiler is running or buying a new boiler. In the first case the boiler is undersized for the house. When we are buying a new boiler we have the opportunity to avoid buying an undersized boiler.
It is a rare case where a boiler is undersized for a home, and while this prevents a cold house on the coldest days of the year, it also reduces potential efficiency gains. In most of the year, the full capacity of the boiler is not required, and with low heating loads a boiler will need to cycle on and off to meet the needs. Modulating boilers reduce this cycling as they can run at a low firing rate. Traditional boilers operate simply on or off at the highest firing rate.
In a home with multiple zones, a condensing boiler works better than conventional boilers due to its ability to modulate, or adjust its firing rate from full fire to a rate that is only 1/3rd of its full firing rate. Therefore, when a single zone in a home requires heat, the boiler is able to handle that requirement at firing rate that is better suited for the job.
Triangle Tube's Prestige and Challenger Condensing boilers are designed to meet the needs of homes with single or multiple zones. When combined with a Smart Indirect Water Heater they make an energy efficient solution to most hydronic heating needs.
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