Clean Burn, the world’s leader in used-oil heating systems, has introduced the CB-500-CTB. The large-capacity used-oil coil tube boiler can recycle large volumes of used-oil (3.6 gallons of used-oil per hour) - a larger amount than the company’s original CB-200-CTB and CB-350-CTB models. Designed to recycle used-oil and produce hot water, the CB-500-CTB can be used for in-floor, baseboard and space heating, as well as for ice melt applications. The CB-500-CTB has an input rating of 500,000 BTU. The CB-500-CTB weighs 1,600 pounds and can heat an area of more than 12,000 square feet. The unit has a low-mass design which holds just 20.6 gallons of water, yet  37 gallons per minute flow through the coil, reveals the company’s press release.