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Across 2. most domestic cookers are this 5. flue system of lastest high efficiency boilers 6. used to be a corgi ? 8. temprature stabilisation 10. a measure of the power the appliance consumes - older bolers may be rated like this 12. room sealed non fanned flue appliance 13. the gas operatives bible ! 15. the test for tightness time and pressure 16. you will not get water from this one ! 17. this one takes air from outside 20. this bright spark starts it all off 23. the usefull heat output, how all modern appliances are rated 25. domestic competancy criteria 26. an older type of boiler flue system 30. these are produced when combustion takes place 33. supply pressure up to 2 bar or 2000mb 34. a product of complete combustion 35. what you would do for the first minute

Down 1. all open flued appliances need this 3. supply pressure of 75mb 4. you can use the gas meter to calculate this 7. not the kind of bar you can buy a drink at ! 9. produced by incomplete combustion 11. now refered to as a chimney 14. a unit of pressure measurement 18. this one can be up to 30mb ! 19. main constitaunt of natural gas 21. a device to control and produce a constant outlet pressure 22. no windows, under 5m cube and too small for habitation 24. a product of complete combustion 27. largest gas meter you can use under UP1B 28. the required running pressure at the meter outlet 29. process for releasing heat 31. let by test pressure 32. the permitted drop across a pipework system when an apliance is running