機器
appliance
background
blue
boiler
building
circulation
construction
control
energy
equipment
factory
gas
gas burner
heat
heater
heating
home
hot
house
industrial
industry
maintenance
measurement
metal
pipe
pipeline
pipelines
pipes
plant
plumber
plumbing
power
pressure
pump
red
renovation
repairman
room
stainless
steel
system
technical
technology
temperature
tube
valve
water
work