{
  "url": "https://openlegislation.uk/water-supply-water-fittings-regulations-1999/schedule-2/paragraph-17",
  "json_url": "https://openlegislation.uk/water-supply-water-fittings-regulations-1999/schedule-2/paragraph-17.json",
  "legislation": "uksi/1999/1148",
  "legislation_title": "The Water Supply (Water Fittings) Regulations 1999",
  "legislation_url": "https://openlegislation.uk/water-supply-water-fittings-regulations-1999",
  "path": "schedule/2/paragraph/17",
  "kind": "paragraph",
  "number": "17",
  "heading": null,
  "text": "(1) Every unvented water heater, not being an instantaneous water heater with a capacity not greater than 15 litres, and every secondary coil contained in a primary system shall–\n(a) be fitted with a temperature control device and either a temperature relief valve or a combined temperature and pressure relief valve; or\n(b) be capable of accommodating expansion within the secondary hot water system.\n(2) An expansion valve shall be fitted with provision to ensure that water is discharged in a correct manner in the event of a malfunction of the expansion vessel or system.",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Sch. 2 para. 17(1)(a) substituted (1.7.1999) by The Water Supply (Water Fittings) (Amendment) Regulations 1999 (S.I. 1999/1506), regs. 1, 2(5)(b)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1999/1148/schedule/2/paragraph/17",
    "retrieved_at": "2026-10-29T10:49:50.692119+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}