| Boilers that are rated above 90% are called | | | | controls or outdoor reset controls. |
| condensing boilers. They are designed to extract | | | | Not only can it save 15% - 20% on your energy |
| heat from the combustion gases that's normally | | | | bill but also increases comfort. It provides a |
| lost in the exhaust lower rated boilers. | | | | constant, steady flow of heat throughout the |
| This energy saving process will only occur under | | | | house. |
| certain conditions. | | | | Some boilers are equipped with this control and |
| Condensing boilers rely on lower water | | | | some are sold as an option. |
| temperatures of 135 degrees F and lower to gain | | | | Stay clear of those who try to sell a condensing |
| higher efficiencies. | | | | boiler without this control strategy if you want to |
| I've seen high efficient rated condensing boilers | | | | reap the benefits of a high efficiency boiler. |
| that were operating at efficiencies in the mid | | | | Another thing you should consider is the material |
| 80% range because the water temperatures | | | | the heat exchanger is made from. |
| were too high to allow the boiler to condense and | | | | For a long-lasting boiler choose one with a stainless |
| release the extra heat into the heating system. | | | | steel heat exchanger rather than aluminum. |
| The best way to ensure low water temperatures | | | | One boiler manufacturer stopped making boilers |
| are to use a control system also adjusts the | | | | with aluminum heat exchangers because of their |
| water temperature according to the outdoor | | | | concern of longevity. |
| temperature as well as the indoor temperature. | | | | Follow these tips and you'll get the return on |
| These systems are called weather responsive | | | | investment you are looking for. |