Personal heaters or space heaters are available in electric, gas and kerosene options. They make great bathroom heaters, as they quickly and efficiently heat a small area with focused warmth. A popular space heater option is an infrared heater, which helps maintain natural humidity, providing heat without drying out the air. Propane Heaters Dec 02, 2014 · How will you know if your heat exchanger may be cracked? Here are several things that you should look out for. Soot Buildup. A buildup of soot is caused by improper combustion that can be a direct result of a cracked exchanger. There may be an accumulation of black soot inside the furnace or close to the cracks in your heat exchanger. Define heat exchanger. heat exchanger synonyms, heat exchanger pronunciation, heat exchanger translation, English dictionary definition of heat exchanger. heat ... Elite FT – Heating Boiler The Elite FT® is a high efficiency heating boiler for residential and commercial applications. This versatile unit is wall hung and comes in two models, ranging from 285,000 to 399,000 BTUs. An exclusively designed stainless steel heat exchanger provides superior heat transfer.