Section 3 - Oil-fired space heating and hot water systems
3.1 - Scope of guidance
- Wet central heating systems.
- Range cookers with integral central heating boilers.
- Vaporising appliances providing secondary heating or hot water.
- Fixed independent space heating devices.
3.2 Oil-fired wet central heating systems
Terminology and applicability of guidance to different scenarios in new and existing dwellings
- The specification of central heating systems in new dwellings – this situation is referred to in this section as a new system.
- The specification of central heating systems in existing dwellings where previously space heating was not provided by central heating – this situation is also referred to in this section as a new system.
- The specification of a replacement central heating system and/or component in existing dwellings where central heating is already installed – this situation is referred to in this section as a replacement system.
- The boiler should have a minimum efficiency (as defined by its HARP value) as given in Table 9 (row a),
- The minimum provisions for system circulation as given in Table 9 (row b),
- The minimum provisions for hot water storage and labelling of storage vessels as given in Table 9 (row c).
- The minimum provisions for system preparation and water treatment as given in Table 1 (row d).
- The system should be commissioned in accordance with the minimum provisions given in Table 9 (row e).
- The minimum provisions for boiler interlock, zoning and time control and temperature control of the heating and hot water service circuits as described in Table 10. An acceptable alternative to these is any boiler management system that delivers the specified zoning, timing and temperature and boiler interlock control provisions. When oil boilers are installed as part of a replacement system, the minimum level of system controls should be provided, as described in Table 10, unless they are already installed and fully operational. If an individual component of the control system is being replaced in an existing system, for example a room thermostat, it is not necessary to upgrade the system to meet the minimum requirements.
- Pipework should be insulated as described in Table 11.
Table 10
3.3 - Oil-fired range cookers with integral central heating boilers
boiler which are provided in new or existing dwellings should meet all of the following conditions:
- The appliance should have two independently controlled burners (one for the cooking function and one for the boiler).
- The boiler should have a Seasonal Efficiency (HARP) value in excess of 75%. The manufacturer’s declaration of appliance performance and HARP value should include the following words:
- “Seasonal efficiency (HARP) = xx%
- Case heat emission value = yy kW
- Heat transfer to water at full load = zz kW
- The efficiency values are used in the Dwelling Energy Assessment Procedure (DEAP) for the energy rating of dwellings. The test data from which they have been calculated has been certified by {insert name and/or identification of Notified body}”.
- The minimum provisions for oil-fired central heating systems with respect to the integral central heating boilers as given in Table 9 (rows b to e).
- The minimum provisions for boiler interlock, zoning and time control and temperature control of the heating and hot water circuits with respect to the integral central heating boilers as given in Table 10 for oil-fired central heating systems. An acceptable alternative to these is any boiler management system that delivers the specified zoning, timing and temperature provisions. When oil boilers are installed as a replacement for existing boilers, the minimum level of system controls should be provided, as described in Table 10 unless they are already installed and fully operational. If an individual component of the control system is being replaced in an existing system, for example a room thermostat, it is not necessary to upgrade the system to meet the minimum requirements.
- Pipework should be insulated as described in Table 11.
3.4 - Continually burning oil-fired vaporising appliances providing secondary heating or hot water
3.5 - Oil-fired fixed independent space heating appliances
Oil-fired fixed independent appliances for primary heating
- The efficiency of the appliance (gross calorific value) should be no less than 60%. The appliance manufacturer’s declaration of appliance performance shall include the following words:
- Each appliance should be capable, either independently or in conjunction with room thermostats or other suitable temperature sensing devices, of controlling the temperatures independently in areas that have different heating needs (e.g. separate sleeping and living areas).