{
  "url": "https://openlegislation.uk/eu-regulation-2015-1188/annex-III/division-5",
  "json_url": "https://openlegislation.uk/eu-regulation-2015-1188/annex-III/division-5.json",
  "legislation": "eur/2015/1188",
  "legislation_title": "Commission Regulation (EU) 2015/1188 of 28 April 2015 implementing Directive 2009/125/EC of the European Parliament and of the Council with regard to ecodesign requirements for local space heaters (Text with EEA relevance)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2015-1188",
  "path": "annex/III/division/5",
  "kind": "division",
  "number": "5",
  "heading": "Specific conditions for seasonal space heating energy efficiency",
  "text": "(a) The seasonal space heating energy efficiency of all local space heaters except commercial local space heaters is defined as:\nηS = ηS,on – 10 % + F(1) + F(2) + F(3) – F(4) – F(5)\nThe seasonal space heating energy efficiency of commercial local space heaters is defined as:\nηS = ηS,on – F(1) – F(4) – F(5)\nWhere:\nηS,on is the seasonal space heating energy efficiency in active mode, expressed in %, calculated as set out in point 5(b);\nF(1) is a correction factor accounting for a positive contribution to the seasonal space heating energy efficiency of electric storage local space heaters due to adjusted contributions for options for heat storage and output; and a negative contribution to seasonal space heating efficiency for commercial local space heaters due to adjusted contributions for options for the heat output, expressed in %;\nF(2) is a correction factor accounting for a positive contribution to the seasonal space heating energy efficiency due to adjusted contributions of controls of indoor heating comfort, the values of which are mutually exclusive, cannot be added to each other, expressed in %;\nF(3) is a correction factor accounting for a positive contribution to the seasonal space heating energy efficiency due to adjusted contributions of controls for indoor heating comfort the values of which can be added to each other, expressed in %;\nF(4) is a correction factor accounting for a negative contribution to the seasonal space heating energy efficiency by auxiliary electricity consumption, expressed in %;\nF(5) is a correction factor accounting for a negative contribution to the seasonal space heating energy efficiency by energy consumption of a permanent pilot flame, expressed in %.\n(b) The seasonal space heating energy efficiency in active mode is calculated as:\nFor all local space heaters except electric local space heaters and commercial local space heaters:\nηS,on = ηth,nom\nWhere:\nηth,nom is the useful efficiency at nominal heat output, based on NCV.\nFor electric local space heaters:\nη S,on = 1 CC × η th,on Where:\nCC is the electric to primary energy ‘conversion coefficient’.\nηth,on for electric local space heaters is 100 %.\nFor commercial local space heaters:\nηS,on = ηS,th · ηS,RF\nWhere:\nηS,th is the weighted thermal efficiency, expressed in %;\nηS,RF is the emission efficiency, expressed in %.\nFor luminous local space heaters, ηS,th is 85,6 %;\nFor tube local space heaters:\nηS,th = (0,15 · ηth,nom + 0,85 · ηth,min ) – Fenv\nWhere:\nηth,nom is the useful efficiency at nominal heat output, expressed in %, based on GCV;\nηth,min is the useful efficiency at minimum heat output, expressed in %, based on GCV.\nFenv are the envelope losses of the heat generator, expressed in %;\nIf the heat generator of the tube local space heater is specified by the manufacturer or by the supplier to be installed in the indoor space to be heated, the envelope losses are 0 (zero).\nIf the heat generator of the tube local space heater is specified by the manufacturer or by the supplier to be installed outside the heated area, the envelope loss factor depends on the thermal transmittance of the envelope of the heat generator according to Table 4.\nTable 4\nEnvelope loss factor of the heat generator\nThermal transmittance of envelope (U)\nU ≤ 0,5\n2,2 %\n0,5 < U ≤ 1,0\n2,4 %\n1,0 < U ≤ 1,4\n3,2 %\n1,4 < U ≤ 2,0\n3,6 %\nU > 2,0\n6,0 %\nThe emission efficiency of commercial local space heaters is calculated as follows:\nη S,RF = 0,94 × RF S + 0,19 0,46 × RF S + 0,45 Where:\nRFS is the radiant factor of the commercial local space heater, expressed in %.\nFor all commercial local space heaters except tube systems:\nRFS = 0,15 · RFnom + 0,85 · RFmin\nWhere:\nRFnom , is the radiant factor at nominal heat output, expressed in %;\nRFmin , is the radiant factor at minimum heat output, expressed in %.\nFor tube systems:\nRF S = ∑ i = 1 n 0,15 × RF nom,i + 0,85 × RF min,i × P heater,i P system Where:\nRFnom,i , is the radiant factor per tube segment at nominal heat output, expressed in %;\nRFmin,i , is the radiant factor per tube segment at minimum heat output, expressed in %;\nPheater,i , is the heat output per tube segment, expressed in kW, based on GCV;\nPsystem , is the heat output of the complete tube system, expressed in kW, based on GCV.\nThe above equation only applies if the construction of the burner, tubes and reflectors of the tube segment as applied in the tube system is identical to a single tube local space heater and the settings that determine the performance of a the tube segment are identical to those of a single tube local space heater.\n(c) The correction factor F(1) accounting for a positive contribution to the seasonal space heating efficiency due to adjusted contributions of controls for heat input and output and if the heat is distributed through natural or fan assisted convection for electric storage local space heaters and a negative contribution for commercial local space heaters related to the capability of the product of regulating its heat output.\nFor electric storage local space heaters the heat output correction factor F(1) is calculated as follows:\nIn case the product is equipped with one of the (mutually exclusive) options shown in table 5, the correction factor F(1) shall be increased with the corresponding value of that option.\nTable 5\nCorrection factor F(1) for electric storage local space heaters\nIf the product is equipped with (only one option may apply):\nF(1) is increased by\nManual heat charge control, with integrated thermostat\n0,0 %\nManual heat charge control with room and/or outdoor temperature feedback\n2,0 %\nElectronic heat charge control with room and/or outdoor temperature feedback or controlled by energy supplier\n3,5 %\nIn case the heat output of the electric storage local space heater is assisted by a fan, an additional 1,5 % shall be added to F(1).\nFor commercial local space heaters the heat output correction factor is calculated as follows:\nTable 6\nCorrection factor F(1) for commercial local space heaters\nIf the heat output control type of the products is:\nF(1) is calculated as:\nSingle stage\nF(1) = 5 %\nTwo stage\nF 1 = 5 % − 2,5 % × P nom − P min 30 % × P nom\nModulating\nF 1 = 5 % − 5,0 % × P nom − P min 40 % × P nom\nThe minimum value of the correction factor F(1) for two stage commercial local space heaters is 2,5 %, and for modulating commercial local space heaters is 5 %.\nFor local space heaters not being electric storage heaters or commercial local space heaters the correction factor F(1) shall be 0 (zero).\n(d) The correction factor F(2) accounting for a positive contribution to the seasonal space heating efficiency due to adjusted contributions of controls for indoor heating comfort, the values of which are mutually exclusive or cannot be added to each other, is calculated as follows:\nFor all local space heaters the correction factor F(2) is equal to one of the factors according to Table 7, depending on which control characteristic applies. Only one value can be selected.\nTable 7\nCorrection factor F(2)\nIf the product is equipped with (only one option may apply):\nF(2)\nfor electric local space heaters\nfor local space heaters using gaseous or liquid fuels\nPortable\nFixed\nStorage\nUnderfloor\nRadiant\nSingle stage heat output, no room temperature control\n0,0 %\n0,0 %\n0,0 %\n0,0 %\n0,0 %\n0,0 %\nTwo or more manual stages, no temperature control\n1,0 %\n0,0 %\n0,0 %\n0,0 %\n2,0 %\n1,0 %\nWith mechanic thermostat room temperature control\n6,0 %\n1,0 %\n0,5 %\n1,0 %\n1,0 %\n2,0 %\nWith electronic room temperature control\n7,0 %\n3,0 %\n1,5 %\n3,0 %\n2,0 %\n4,0 %\nWith electronic room temperature control plus day timer\n8,0 %\n5,0 %\n2,5 %\n5,0 %\n3,0 %\n6,0 %\nWith electronic room temperature control plus week timer\n9,0 %\n7,0 %\n3,5 %\n7,0 %\n4,0 %\n7,0 %\nThe F(2) correction factor does not apply to commercial local space heaters.\n(e) The correction factor F(3) accounting for a positive contribution to the seasonal space heating efficiency due to adjusted contributions of controls for indoor heating comfort, the values of which can be added to each other, is calculated as follows:\nFor all local space heaters the correction factor F(3) is the summation of the values according to Table 8, depending on which control characteristic(s) applies.\nTable 8\nCorrection factor F(3)\nIf the product is equipped with (multiple options may apply):\nF(3)\nfor electric local space heaters\nfor local space heaters using gaseous or liquid fuels\nPortable\nFixed\nStorage\nUnderfloor\nRadiant\nRoom temperature control with presence detection\n1,0 %\n0,0 %\n0,0 %\n0,0 %\n2,0 %\n1,0 %\nRoom temperature control with open window detection\n0,0 %\n1,0 %\n0,5 %\n1,0 %\n1,0 %\n1,0 %\nWith distance control option\n0,0 %\n1,0 %\n0,5 %\n1,0 %\n1,0 %\n1,0 %\nWith adaptive start control\n0,0 %\n1,0 %\n0,5 %\n1,0 %\n0,0 %\n0,0 %\nWith working time limitation\n0,0 %\n0,0 %\n0,0 %\n0,0 %\n1,0 %\n0,0 %\nWith black bulb sensor\n0,0 %\n0,0 %\n0,0 %\n0,0 %\n1,0 %\n0,0 %\n(f) The auxiliary electricity use correction factor F(4) is calculated as:\nThis correction factor takes into account the auxiliary electricity use during on-mode and standby-mode operation.\nFor electric local space heaters the correction is calculated as follows:\nThe auxiliary electricity use correction factor F(4) is calculated as:\nF 4 = CC × α × el sb P nom × 100 % Where:\nelsb is the standby electric power consumption, expressed in kW;\nPnom is the nominal heat output of the product, expressed in kW;\nα is a factor taking into account whether the product complies with Commission Regulation (EC) No 1275/2008:\nif the product complies with the limit values set in Regulation (EC) No 1275/2008, α is by default 0 (zero),\nif the product does not comply with the limit values set in Regulation (EC) No 1275/2008, α is by default 1,3.\nFor local space heaters using gaseous or liquid fuels the auxiliary electricity use correction is calculated as follows:\nF 4 = CC × 0,2 × el max + 0,8 × el min + 1,3 × el sb P nom × 100 % Where:\nelmax is the electric power consumption at nominal heat output, expressed in kW;\nelmin is the electric power consumption at minimum heat output, expressed in kW. In case the product does not offer a minimum heat output the value for the electric power consumption at nominal heat output shall be used;\nelsb is the electric power consumption of the product while in standby mode, expressed in kW;\nPnom is the nominal heat output of the product, expressed in kW.\nFor commercial local space heaters the auxiliary electricity use correction factor is calculated as follows:\nF 4 = CC × 0,15 × el max + 0,85 × el min + 1,3 × el sb P nom × 100 %\n(g) The correction factor F(5) related to the energy consumption of a permanent pilot flame is calculated as follows:\nThis correction factor takes into account the permanent pilot flame power requirement.\nFor local space heaters using gaseous or liquid fuels it is calculated as:\nF 5 = 0,5 × P pilot P nom × 100 % Where:\nPpilot is the pilot flame consumption, expressed in kW;\nPnom is the nominal heat output of the product, expressed in kW.\nFor commercial local space heaters the correction factor is calculated as:\nF 5 = 4 × P pilot P nom × 100 % In case the product has no permanent pilot light (flame) Ppilot is 0 (zero).\nWhere:\nPpilot is the pilot flame consumption, expressed in kW;\nPnom is the nominal heat output of the product, expressed in kW.",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "Commission Regulation (EC) No 1275/2008 of 17 December 2008 implementing Directive 2005/32/EC of the European Parliament and of the Council with regard to ecodesign requirements for standby and off mode electric power consumption of electrical and electronic household and office equipment (OJ L 339, 18.12.2008, p. 45)."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2015/1188/annex/III/division/5",
    "retrieved_at": "2026-11-01T14:46:34.619602+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."
}