EB-S-23 TS Series Electro Industries Electric Radiant Heating Staging Hot Water Boiler-80,000BTU, 100% Efficient EB-S-23 TS Series Electro Industries Electric Radiant Heating Staging Boiler-80,000BTU Our most deluxe model is designed for multiple temperature and zoning applications. This model has the ability to sense water temperature and maintain an accurate boiler temperature output by only energizing the electric elements for needed output (not full capacity). This model eliminates extra costs associated with relays, extra temperature controls, zone boxes, etc. Our more experienced installers use this boiler to avoid the extra cost of the above.Outdoor sensing with outdoor reset capability. The target supply temperature ramps up as it is colder outside As part of our EB-S TS Series Electric Boiler Series, the hot water electric boiler offers complete application flexibility. Features - 185 F hi-limit, compact, easy to install, ASME H Stamp, and parcel post shippable.