boil
boiler
brush
calcification
calcium
cleaning
connector
damaged
defective
deposition
detail
device
dirt
disassembly
disposal
electric
element
energy
equipment
faulty
hand
hard
heat
heater
heating
heating element
industrial
inside
limescale
limestone
maintenance
mineral
modern
obsolete
old
pipe
plumber
plumbing
problem
repair
sediment
steel
system
technical
tubular
定額
Cleaning the heating element of the boiler. A man cleans scale from TEN with an iron brush. Repair and maintenance of electric boilers.の素材 [FY310169774540]
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