O1 Advanced Mechanical Services is a provider of products and services such as gas, water and heating installation inspection and maintenance,boiler installation work,water plumbing work,drain-laying work,sanitary fixture installation work,plumbing and drain-laying work,sanitary works,plumbing - works,district heating and hot water supply operators,training courses, plumbing,installation services,heating, repair services,steam heating, systems (suppliers of heat),plumbing, engineers ,heating systems, cleaning and repair,heating systems, repair and maintenance.