Individual appliance modules, CEN1 and WAT1, have been replaced with CENWAT, which became effective from 1st April 2011. The types of domestic appliances covered by CENWAT (Central Heating and Hot Water) training includes:
  • Open and balanced flue (natural draught and fan assisted)
  • Central heating & hot water boilers
  • Circulators
  • Combination boilers
  • Storage water heaters
  • Instantaneous water heaters with a heat input equal to or less than 70kW.
The CENWAT assessment is not fuel specific and the range of appliances covered may be supplied by either Natural Gas (NG) or Liquefied Petroleum Gas (LPG). Prior to taking CENWAT, gas engineers will need to hold an appropriate valid ACS core gas safety assessment and CPA1. CENWAT is designed to assess the competence of a gas engineer to install, exchange, commission, disconnect, service, carry out repair and attend to breakdown of appliances. However, as with all ACS assessments CENWAT will only assess an engineer's competence in matters of gas safety, it will not assess other associated key skills such as plumbing or the electrical installation etc. Appliances fitted in commercial premises Many domestic gas boilers and water heaters covered by CENWAT are fitted in commercial premises; in this case an engineer holding an appropriate commercial ACS core may undertake CENWAT without holding CCN1 or CCLP1. The Gas Safe Register will recognise this combination of assessments as proof of competence to work on these appliances, but will not issue a license card for domestic gas boilers or water heaters. Examples where a domestic appliance may be fitted in commercial premises with the appropriate ACS core assessment could be as follows.
  • 30kW NG System boiler fitted in a plant room (COCN1)
  • 35kW NG Combination boiler fitted in catering kitchen (CCCN1)
  • 24kW LPG water heater fitted in a commercial laundry (CCLNG1 + CoNGLP1 (PD)
The Assessment A typical practical CENWAT assessment for an engineer carrying this out for the first time will include:
  • Completing the installation and commissioning of a gas boiler
  • Identifying gas safety components
  • Installation faults and servicing in accordance with the manufactures instructions
  • Operational and performance check of an instantaneous water heater, including temperature rise and flow rate.
Gas engineers whose CEN1 and WAT1 assessments are expiring may undertake CENWAT as a reassessment, which omits the installation element and requires fewer knowledge questions to be answered.

CENWAT training forms part of Logic4trainingโ€™s Gas Safety (CCN1) and appliances course, or is available as a stand-alone appliance module.

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