Houseneeds.com and eComfort.com are two places that sell electric boilers. Using sensors, these boilers recognize which heating elements need to turn on to maintain the desired water temperature.
Some electric boilers, such as the Electro Electric Mini Boiler Warmflo (mode number EMB-H-7), are set up to complete multiple zoning and temperature applications. This model contains sensors that allow it to keep a relatively precise level of temperature by activating the minimum number of elements. This type of electric boiler does not need zone boxes, extra temperature controls or relays, meaning that the unit itself is less expensive, as is installation.
When looking for an electric boiler, some of the attributes to look for include a built-in gauge for temperature and pressure, a control panel that is easy to access and a temperature dial that is easy to find on the front cover of the unit. A two-year warranty on parts is customary with this sort of heating unit. A heavy duty enclosure made of sheet metal adds durability to the unit, and a steel vessel resists corrosion over time. With those materials, it is possible for the manufacturer to extend a 20-year warranty for the unit. A temperature range that can go as high as 180 degrees Fahrenheit is fairly standard.