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Article Date: 17th October 2013

Daikin Heat Pumps Save Residents £750 a Year in Bath Social Housing Properties

Heat Pumps - Renewable Heating - Heating Systems - Climate Control

Daikin Heat Pump

Background

The heating systems in two homes at Innox Grove, Englishcombe Village, near Bath were becoming costly for residents to run. One of the properties ran on solid fuel and the other had electric storage heaters.

In addition to the expense of running the existing heating system the solid fuel system was proving difficult to manage for one resident who has a disability and some difficulty leaving the house. The coal was messy and it was becoming hard for the elderly resident to bring this in from outside her home. Cleaning and lighting the fire was so difficult that her electric heater would often be the preferred option. In poor weather it was worrying whether the coal delivery could get through the village.

A second household consists of a young family who were struggling to pay their heating bills. The heating was provided by electric storage heaters which were inadequate and costly to run. The family was in need of heating which would provide constant heat when required as the current system tended to run out later in the day. A cheaper form of heating was required as the family were classed as fuel poor.

The homes are managed by Curo which is one of the largest housing and support organisations in Bath and North East Somerset. Curo manages nearly 13,000 homes and is building around 300 new homes every year.

The solution

The two homes in Innox Grove are off the mains gas grid so renewable methods of heating were considered in order to provide lower running costs for the householders. Detailed surveys of the dwellings were carried out by the installer, Pink Heating of Clifton, Bristol, to measure all the rooms and determine insulation levels.

With this information, room-by-room heat loss calculations were carried out, in accordance with the guidelines of the Microgeneration Certification Scheme (MCS), to enable an appropriately sized heat pump and correctly dimensioned heat emitters to be selected.

The Daikin Altherma 11kW Low Temperature Monobloc heat pump system was installed at the two properties. This system was chosen because space was limited at Innox Grove and it does not require an indoor unit.

Daikin Altherma simulation software was used to calculate possible savings at the two properties. In the house which had the solid fuel system, running costs were estimated at around £790 if an oil boiler was fulfilling the heating requirement. However, using the heat pump system, a projected cost of approximately £440 was calculated resulting in a saving of up to £350 per annum. The calculations for the second home which ran on electric storage heaters were approximately £1060 for electricity, or £670 for an oil boiler replacement, with a heat pump costing around £310 per year. This shows significant savings of up to £750 over the existing electric storage heating.

Keith Cloke from Curo said: “Our customers are very happy with the performance of their new heating systems and the reduced cost of heating bills. The systems are likely to be installed in further social housing which is off the gas grid.”

One of the residents, Patricia Hunter, is delighted with her newly installed heating system and told Curo that she “is absolutely delighted to have a system which is constantly warm and cosy, with lots of hot water”.

The heat pump system

The air-to-water heat pump system consists of an externally fitted heat pump unit and a domestic hot water cylinder situated internally within the home. The outdoor unit contains all the key hydraulic components including a circulation pump and expansion vessel.

The Daikin Altherma LT Monobloc system works by capturing heat energy from the outside air and transferring this into the property as useable warmth which is emitted via radiators and as hot water.

The installation

The installation was carried out by Pink Heating, of Clifton, Bristol, a Microgeneration Certification Scheme approved installer, which has been carrying out air-to-water heat pump installations to replace previous Economy 7, oil, LPG gas, solid fuel and electric systems.

Following the installation, Pink Heating showed the householders how to use their new heat pump systems and provided them with a simple user guide, explaining how to set the system to maximise energy efficiency.

Conclusion

The Innox Grove pilot project demonstrates how Curo has applied a renewable technology to improve the lives of customers and lower their heating bills, helping to alleviate fuel poverty and reduce carbon emissions.

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