1. Central Heating (Pipework Only)

2. Forced circulation through loop pipework only Central Heating – One pipe system Central Heating – Types of systems (Part 1) - One pipe system

3. Circulation through radiator is forced Central Heating – Types of systems (Part 1) - Two pipe system

4. No independent temp control of HW on gravity system Central Heating - Semi gravity system Open vent Cold Feed Cold Feed to Cylinder Gravity primary pipework Pumped Heating pipework Anti gravity valve (page 6)

5. Central Heating Building regulations Approved Document L Approved Document L covers central heating Why do we need legislation for central heating ? To help combat global warming.. but what is the cause of global warming? It is CO² being released in to the atmosphere The Government is committed to reducing the amount of CO² we release in to the atmosphere each year. Share of CO² Emissions for 2000

6. Central Heating Building regulations Approved Document L What does this document set out to then ? … it makes many changes to the way buildings are built but the ones that concern us as plumbers the most are : Replacement of heating systems (including boilers and hot water storage cylinders). Heating and hot water controls Commission of heating systems and the provision of instructions for users.

7. Central Heating – Types of systems (Part 1) Building regulations Approved Document L SEDBUK SEDBUK rating of boilers Seasonal Efficiency Domestic Boilers in UK 1 st April 2002 minimum rating was band D 1 st April 2005 minimum rating is now band A or B SEDBRUK rating has been specifically designed for the SAP energy rating Standard Assessment Procedure

8. Honeywell Zone valve controlled by stat fitted in return to keep open vent clear Injector tee fitted here for pumped heating return connecting into gravity return for alternative return connection. ENL No temp control of HW on gravity system Central Heating - Semi gravity system