Consistent performance, unmatched durability. The Hubbell Synergy Hydro BWXP is a fully packaged instantaneous indirect water heater. BWXP heats potable water using boiler water from a condensing boiler or other heat sources. Compared to U-tube, the plate-type heat exchanger allows for more efficient heat transfer at lower boiler water temperatures. On demand design reduces standby heat loss and operating costs. Small footprint for compact spaces. Only non-ferrous components on domestic wetted side. Simplified installation with factory selected and sized boiler water control valve.