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2 user's manual. Dear Customer,. Thank you for choosing an ARISTON boiler. We guarantee installation. Registration is online at www.ariston.co.uk. . 1. Display. 2. Domestic Hot Water adjustment button +/-. (only for Clas HE EVO models). You have chosen to download this manual. Ariston Clas HE 30, please click on the PDF link below: Save to your online account (What's this?) Appliance type: CLAS HE SYSTEM 18. CLAS HE the operating manual, and should provide all necessary out in the installation and servicing manual, inefficient flue system, poor 2. 3. 4. 5. 6. 7. 8. 13. 14. 12. 11. 10. 9. Legend : 1. Display . Reset button. CLAS HE. CLAS HE 24. CLAS HE 30. CLAS HE 38 Page 2 . Instructions for Opening the Casing and Performing an .. These instructions are suitable for CLAS HE boilers : .. bar, particularly at night, then a suitable pressure limiting valve.Instructions for Opening the Casing and Performing an .. an efficient after sales service, please register the guarantee online at www.ariston.co.uk . 2. Domestic Hot Water temperature adjustment button +/-. (only for Clas HE EVO models). 3.