blaze
blue
boiler
burner
butan
carbon monoxide
checking
closeup
co
co2
combustion
control
copper
danger
device
equipment
exchanger
fire
flame
fuel
gas
glowing
heat
heater
hot
house
hydrocarbon
injector
invisible
kitchen
leak
malfunction
naturalgas
no color
no smell
nozzle
old
pipes
poisoning
power
radiator
radiators
repair
saving
silent
temperature
water
winter
worn
定額
Old copper gas boiler without protective casing.The boiler is in operation mode.you can see the control panel of the boiler. the concept of carbon monoxide leakage and poisoning.safety of exploitationの素材 [FY310131054833]
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