Insulating exposed hot water pipes coming from the heating system and hot water tank is an easy and inexpensive way to reduce your energy bills and improve comfort. Preformed foam insulating sleeves come in various sizes at hardware and home center stores. They can easily be cut with crimping tool or a utility knife. For elbows, cut the sleeve at a 45-degree angle and rotate the insulation for the best fit. Duct tape can be added to ensure tight seams if desired. As a rule, copper pipes found in the home are usually 1⁄2” copper pipe from the water heater and 3⁄4” pipe from the heating system. If you are not certain try a piece of insulation for the best fit.
Caution: Keep insulation at least 12” from any furnace or water heater flue pipe.