機器
appliance
boiler
boilers
burner
button
central
cold
condensation
control
design
ecology
electric
energy
energy conservation
equipment
fire
furnace
gas
heat
heater
heating
home
hot
house
icon
industrial
industry
interior
measurement
metal
pipe
pipes
piping
plumber
power
pressure
pump
room
service
sign
steel
symbol
system
tank
technology
temperature
thermal
water