Residential gas water heater shipments increased 14% in April compared with April 2009, while residential electrical heater shipments increased 3%.

Residential gas water heater shipments increased 14% in April compared with April 2009, while residential electrical heater shipments increased 3%. For the year-to-date, U.S. shipments of residential gas water heaters increased 11% and residential electric water heater shipments increased 4% compared to the same period 2009. Shipments of commercial units also were up slightly, according to data from the Air-Conditioning, Heating & Refrigeration Institute.