The RADIANT HEAT SOURCE models use digital microprocessor controls and uses standard field replaceable heating elements. The guarantee on the units is not very good when compared to other brands.
The MONITRON EH series units are available in nine sizes from 8 to 40kw to match the needs of your home. They feature a durable cast iron heat exchanger and are wall mounted. The elements in the units are staged to where for each 30 seconds of operation another element is energized. This allows the units to closely match the heat requirements of the home. They have a dealer locator by state on their website and the units are backed by a very good warranty.
This brand is made and sold in the Czech Republic. The SL ELEKTRO series features wall hung boilers in seven sizes to match the needs of the home. Their website is not much help and does not have a stated guarantee for their products.
The EH12 LUX boilers are made in Austria and sold in Europe. The units are designed to be inexpensive and easy to install but their website is not much help and does not have a stated warranty policy.
This brand is made in Canada by ALLIED ENGINEERING CO. The MINI STAR features a three stage microcontroller with outdoor reset temperature control. The units are wall hung to save space and have six modes of operation for flexibility but the guarantee is not very good.
These units are made in Norway and are available in Europe and North America. They feature modulating control and are available in five sizes to match the needs of your home. The units are wall-hung for space savings and are available for central heating only or heating/domestic hot water. The E version has weather compensation controls for increased efficiency but the guarantee on the brand is not very good.
These boilers are made in Turkey and are available in five sizes to match the size of the home. They can produce domestic hot water as well as providing central heating water. They have a three speed pump and use electronic modulation to match the requirements of the home. They require a three phase power supply which is not common for homes. Their website is not much help and does not have a stated warranty policy.
This brand is made in Serbia and is sold throughout Europe. The ETK(E) units are available in seven sizes to match the heating needs of the home. Their website is not much help and does not have a stated guarantee for their products.