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24.—(1) Where more than one qualifying action of a type referred to in the first column of Table 3, set out in this article, is provided at the same premises, the Authority must determine the carbon emissions reduction in accordance with paragraph (2).
(2) Where paragraph (1) applies, the Authority must—
(a)determine the whole house bonus applicable to each qualifying action by reference to the corresponding percentage in column 3 of Table 3;
(b)determine the sum total of any whole house bonuses applicable (“the total whole house bonus”); and
(c)further increase the carbon emissions reduction determined under article 23 for each qualifying action listed in the first column of Table 3 by the total whole house bonus.
| Description of qualifying action | Individual measure adjustment | Whole house bonus |
|---|---|---|
| Cavity wall insulation | -50% | +10% |
| Connection to a district heating scheme | 0% | +40% |
| District heating meter for individual house billing | 0% | +10% |
| Double glazing | 0% | +10% |
| Draught proofing | 0% | +10% |
| Flat-roof insulation | 0% | +10% |
| Fuel switching | 0% | +40% |
| Heat pump | +50% | +50% |
| Heating controls when provided with a new heating system | 0% | +10% |
| Loft insulation | -50% | +10% |
| Replacement boiler | +50% | +40% |
| Solid wall insulation (external) | +200% | +50% |
| Solid wall insulation (internal) | +200% | +50% |
| Under-floor insulation | 0% | +10% |
| Microgeneration measures consisting of: | ||
| Biomass boiler | +50% | +40% |
| Micro combined heat and power unit | +50% | +10% |
| Micro Hydro unit | 0% | +10% |
| Micro Wind unit | 0% | +10% |
| Mini-wind unit | 0% | +10% |
| Photovoltaic panels | 0% | +10% |
| Solar water heater | +50% | +10% |
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