Profile: Aqua-Hot Heating Systems Inc. manufactures hydronic heating systems. Our electric heating element provides heat in moderate and ambient temperatures. Our tankless hot water heating system are used to provide hot water. We also manufacture cozy heat exchanger specifically designed for heating systems. Our heating system accessories include heat exchangers, whisper heat exchanger, nozzles, louvers and pex tubing. We sell a variety of nozzles from 2½" to 4_" diameters.