How often should the gas appliance be serviced?
All domenstic gas appliances should be serviced at intervals not exceeding two years. Commercial gas hot water applications should be serviced at intervals never exceeding one year. 12. I would like to know where the nearest Bosch service agent is in my area. Please contact our customer support centre on the following number with your postcode ready and we will recommend an agent near to you. If calling from Australia, please dial: 1300 30 70 37. Alternatively, if calling from New Zealand, please dial: 0800 54 33 52.