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Table 1: Renewable energy analysis (based on 2006 prices) comparing standard B&Q system of heat pumps suspended from ceiling against underfloor heating and cooling
SystemRooftop warm-air AHU Geothermal with suspended water to air heat pumps Geothermal with water to water heat pumps and underfloor system
HeatingGas-firedGeo heat pumpGeo heat pump
CoolingDXÌýÌý
ElectricityGridGeo heat pumpGeo heat pump
ÌýÌýGridGeo heat pump
Annual energy cost£192,000£168,000£158,000
Scheme capital cost£270,000£414,000£577,000
Affected structure capital cost£107,000£57,000£205,000
25-year energy costs£2,689,000£2,357,000£2,220,000
25-year lifecycle/replacement costs£401,000£344,000£240,000
25-year planned preventive maintenance£989,000£989,000£329,000
25-year TOTAL£4,445,000£4,161,000£3,571,000
Simple payback based on year 1 costsÌý3.9912.13
Savings compared with base system (based on 25-year total)Ìý£294,000£884,000
Summary of renewable technologies
Feature Performance Proportion of total energy
Geothermal heat pumps650kW heating, 440kW cooling using five heat pumps14.19%
Wind turbine A 20kW wind turbine will provide up to 30,000 kWh1.52%
Photovoltaic panels 49m2 predicted to give 4900kWh per annum 0.17%
Solar water heating 50m2 solar panels provide preheat water heating for domestic purposes0.80%
Rainwater recovery 20,000 litre underground tank provides 92% of water required for water plants in garden centre and toilet flushing Ìý