A. On condition that types 1-23 in all respects and/or in the manner of their fitting meet any relevant requirement of the regulations.
6. Any work associated with a fixed combustion appliance installation or other part of a heating installation not being work of types 7 or 8 below. Except-Any work associated with a solid fuel appliance having an output rating more than 50kW, an oil-firing appliance with an output rating more than 45kW or a gas-fired appliance having a net input rating more than 70 kW. Any work associated with a chimney, flue pipe or hearth. An oil storage tank with a capacity of more than 90 litres, including any pipework connecting the tank to a combustion appliance providing space or water heating, or cooking facilities. Any work adversely affecting a separating wall.