Two heating boilers - pros and cons

When it comes to setting up the heating system of large buildings, some customers prefer two smaller boilers instead of one powerful one. Why connect two boilers to one heating system when it seems one would do? Let's figure it out.

Fuel savings in the off-season
A boiler works most efficiently at 80-100% of its output, so one large boiler cannot work properly in the off-season when such output is not needed. It makes much more sense to start one small boiler first and the second one when frosts set in. One large boiler is guaranteed to consume much more fuel in the off-season than less powerful equipment.
 

 A reliable heating system
When one boiler needs unscheduled maintenance, the second one acts as a backup, replaces the main one and keeps the premises warm. I think everyone has been left without heating in the cold season at least once. Unpleasant, isn't it? You can minimise the chance of finding yourself in such a situation.

Longer service life
Two boilers can be alternated - this obviously extends the service life of the equipment.

 Two boilers take up more space, but there are nuances here.
Firstly, two small boilers need a smaller installation opening to be brought into the boiler room if installation or removal is planned in an existing room. Secondly, there are solutions that do not require extra space, for example FACI gas boilers, which can be stacked on top of each other, so you actually save floor space while doubling the output.

You may think that installing two boilers is very expensive, but then calculate how much it would cost to replace a boiler that failed because of incorrect loading. Not to mention the direct and quite significant losses a company would suffer during an unscheduled, long heating outage and fuel overconsumption!

We are ready to advise you if you are interested in this topic.

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