An indirect water heater is one of the most energy-efficient, low-cost water heaters on the market today. In fact, when paired up with a specially designed high-efficiency boiler, these water heaters steal the show. Whether you need a replacement for a broken heater or you're just looking for a smart, water-heating alternative, an indirect model water heater should be at the top of your shopping list.
Not to be confused with a tankless coil water heater (though they are similar), an indirect heater uses a storage tank and the heat from your boiler to provide your home with all the hot water you and your family needs. In an indirect system, water is heated up by your main boiler. That water is then circulated by the system pump into a storage tank, much like a traditional water heater, where the hot water is kept until it's needed. A good quality Indirect fired water heater has much better insulation around the tank to keep the heat in the water for increased efficiency.
Compared to other alternatives, an indirect model water heater saves you money in two distinct ways. The first and most important way is by utilizing your space heater to heat water. By using your boiler to heat water and air you are getting more bang for your buck compared to a traditional model, especially during cooler months when your boiler runs regularly anyway.
If outdoor temperatures always remain cool, then a tankless coil water heater would be all a person needs to get energy-efficient water heating. In fact, if you do live in a cold climate it probably pays to compare the two types of heaters in order to find out which is going to be more effective for your situation. It's for the rest of us living in warmer climates that the storage tank on an indirect unit becomes a nice addition. With both tankless coil and indirect systems, your main furnace or boiler will have to kick on to heat water, even when it's 100 degrees outside. With a good storage tank, however, you can drastically reduce how often your heating system needs to fire up in order to provide hot water to your home.