BTU, or British thermal unit, is the industry-standard used to measure the heating efficiency of furnaces. In addition to BTU ratings, furnace manufacturers might include a Manual J Load rating and a percentage of energy efficiency.
A debenture is a type of debt instrument that is not secured by physical assets or collateral. Debentures are backed only by the general creditworthiness and reputation of the issuer. Both corporations and governments frequently issue this type of bond to secure capital.
Subordinated Debenture Bond. A class of unsecured bond that, in the event of liquidation, is prioritized lower than other classes of debt. In essence, a subordinated debenture bond is an unsecured loan, which has no collateral. Should the issuer be liquidated, all other bonds and debts must be repaid before the subordinated debenture bond is repaid. This class of debt carries higher risk, but also pays higher interest than other classes.