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Gas appliances should be safety checked & serviced at least once every year , unless otherwise specified by the manufacturer . {{USERNAME}} will carry out a thorough service on your boiler and gas supply to ensure that the appliance is operating safely . {{URL}}
 product: Gas appliances; group: manufacturer; product: boiler; product: gas supply; product: appliance
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: group, creative work, person, event, product, location, corporation 
Text: {0} 
Answer:
 product: Gas appliances; group: manufacturer; product: boiler; product: gas supply; product: appliance