On-Demand High Efficiency Boilers
The new Energy Star certified home that we’re building at work for a client includes a NTI Trinity on-demand high efficiency gas (propane) boiler. This amazing on-demand high efficiency boiler provides all of the domestic hot water and hot water for the heating system. The heating system includes a combination of base board hot water and radiant floor heating.
The photo shows the entire heating system completely installed. The gray rectangular box in the center of the black plywood is the actual boiler. This boiler is producing all the hot water for a 2400 sq. ft. house on-demand!
The boiler is vented up through the roof using PVC pipe. The fresh air is also produced from a PVC pipe through the roof. The pipes to the right of the boiler are the manifolds that supply hot water to the radiant system. The piping to the left of the boiler is for all the zone pumps that supply the base board and radiant zones. The big difference here is the lack of a hot water storage tank.
On-demand boilers offer much higher overall efficiency because the hot water is made as it’s needed. In a traditional set up you’d have a boiler that generates hot water to be stored in a tank. The tank holds the hot water waiting to be used. Over time the hot water can lose heat when it’s not being used. With an on-demand boiler you only make the hot water you need.
We’ve installed this type of boiler in several houses and they work great. They are able to produce all the domestic hot water you could ever use while still providing hot water for your heating system.
In addition to being very energy efficient they are also extremely quiet and small in size. The units are so small you can easily install them in very small areas (as code will allow). You can be standing 5 or 6 feet away from these and not even know they are running. Venting through the roof is also a nice benefit because it keeps the steamy exhaust away from windows and vents.