Applicants should be experienced installers of gas, oil, or solid fuel domestic central heating systems. You must have at least one of the following prerequisites: ACS, OFTEC, N/SVQ Level 2 or 3 in plumbing (or equivalent), N/SVQ Level 2 or 3 in heating and ventilating (or equivalent), N/SVQ Level 2 or 3 in gas installation/maintenance (or equivalent), N/SVQ Level 2 or 3 in oil-fired technical services (or equivalent) or a Previous energy efficiency cert.