2. Cold feed to hot water cylinder Sink Basin Bath Drain valve Stop valve WC cistern 100 litre (minimum storage cistern)

3. Cold feed to hot water cylinder Sink Basin Bath Drain valve Stop valve WC cistern 230 litre (minimum storage cistern)

8. Hot water distribution pipe Cold water supply

9. Direct Hot Water Cold water in at the bottom of a cylinder hot water out from the top of a cylinder The cylinder needs to be insulated to make the cylinder energy efficient and reduce wastage Pipes should be lagged up to 1 meter from the cylinder or until they disappear into the floor or wall.

10. Indirect Hot Water

11. Emersion Heater

12. Stop Tap

13. Insulation

14. Cold Water Storage Tank

15. Float Operated Valve

17. Cold Water Storage Tank Stop Valve Supply to system Warning pipe Screened vent Float operated valve

20. Boiler The boiler is the part of the system that heats the water. It burns fuel (oil, gas, coal & wood) in a chamber within the boiler; at the top of this chamber there is a heat exchanger (like a reverse radiator) that takes the heat from the combustion and transfers it to the water. The exhaust gasses are vented outside via a flue or chimney sometimes the exhaust is fan assisted.

21. Fuel supply (Gas) STAR T Cold water in Hot water out Exhausts Fume

22. Cold Water Storage Tank Stop Valve Supply to system Warning pipe Screened vent Float operated valve

23. Indirect Hot Water Cylinder A hot water cylinder heats and stores hot water used for washing in the bath, sink, basin, etc.. There are two separate water systems within the cylinder;- The primary circuit brings hot water through the cylinder from the boiler. This circuit is usually in the form of a copper coil. The secondary circuit is water that we are going to wash with this comes from the cold water storage cistern into the bottom of the cylinder and is heated by the primary circuit. Once the cylinder is full of hot water a thermostat on the cylinder sends a signal to the boiler to turn of

24. Flow Return Cold water supply from storage tank Hot water supply to basin, bath, shower, etc…