PROBOIL 2 to PROBOIL.2X Upgrade Installation Guide v1b 1PROBOIL2 to PROBOIL.2XUpgrade Installation Guidewww.proboil.co.ukSee top of boiler unit for contact details Please read these instructions carefully before installationWe have a policy of continued product and quality development and improvement.Accordingly, we reserve the right to amend the specification at any time. All errors and omissions excepted.