HVACR technicians inspect and maintain heating and cooling systems. Heating, air conditioning, and refrigeration mechanics and installers held about 267,600 jobs in 2012, of which 61 percent were employed in the plumbing, heating, and air-conditioning contractors industry.About 9 percent were self-employed.nstallation, maintenance, and repair occupations. 10%. Employment of heating, air conditioning, and refrigeration mechanics and installers is projected to grow 21 percent from 2012 to 2022, faster than the average for all occupations.
With all needed parts and labor, hiring a plumber to install a traditional gas water heater costs $300-$3,500 or more, depending on capacity (with 40 or 50 gallons the most common sizes); length of warranty (typically 5-12 years); and the amount of repairs required to meet current building codes.
1 An electric water heater can cost $400-$3,000 or more for complete installation of a conventional storage-tank model and $1,800-$4,500 or more for a tankless model (including a 220V/240V outlet). 2  Electric water heaters typically cost less than gas units but are more expensive to operate.