HEATING & HOT WATER A district heating system delivers thermal


energy in the form of hot water from a central source to end users using a network of insulated pipes. This network could be designed to serve a single block of flats or an entire city


plan to power a new development of 2,500 homes using district heating will reduce carbon emissions by up to 70 per cent.


The outlook


The UK is taking a slightly different approach to district heating than they have on the continent. There, water leaving the central energy centre may be up to 90˚C, whereas the drive in the UK is to have a maximum primary temperature of 70˚C. This gives greater cost and efficiency benefits as a wider range of heat sources can be used, from heat pumps to energy from waste, recovered geothermal energy and renewable energy. Ideal Heating has developed the POD HIU specifically to suit these systems, which comes in two models:


3. Each end user then has a Heat Interface Unit (HIU), like the Ideal Heating POD, which transfers heat from the distribution network to the end user’s heating system or is used to generate instantaneous hot water. The HIU looks just like a domestic combi boiler from the outside and has similar controls, but instead of burning gas it uses heat exchangers to transfer thermal energy from the hot water in the distribution network to the water in the property’s heating and hot water systems.


What are the advantages?


District heating is a flexible, tried and tested technology that has been safely and effectively heating homes around the world for more than a century. Having a single heat source, the energy centre, can generate


economies of scale and help the whole system operate more efficiently, in turn reducing carbon emissions. The versatility of heat networks means they are suitable for all building types, from bungalows to high rise flats, businesses and public buildings, regardless of their age or fabric. While they are typically used in high-density built-up


areas such as city centres, they can also heat new build developments and campuses as well as off-gas communities in rural locations.


For end users, heat networks can achieve lower energy bills because a central energy centre can be more efficient than individual boilers in each property. The impact on greenhouse gas emissions can be even more


impressive. Veolia reports that the District Energy heat network that it operates in Sheffield cuts carbon emissions by more than half, and analysis by Devon County Council suggests that a


• POD Indirect is a twin plate appliance to provide complete separation from the heat network for both heating and hot water.


• POD Direct is a single plate appliance, enabling heat from the network to directly heat the heating system and indirectly generates instantaneous Domestic Hot Water (DHW).


All the indirect POD HIUs are BESA registered. The rapid roll out of heat networks brings an exciting


proposition on the pathway to Net Zero. With over 100 years of experience providing high-quality heating solutions, we are committed to supporting the UK on its drive to Net Zero. We recognise the role we can play in helping to make that journey as easy as possible for contractors and installers, not just from the perspective of the devices we design but also the training we offer to ensure everyone can be upskilled in installation.


TWIN FLUE TECHNOLOGY Designed to go the distance 10 years


20% hydrogen blend ready


Twin flue up to 27m**


Compatible with Halo control


IN STOCK NATIONWIDE


*Keston boilers have warranties of up to 7 years when installed with a Keston System Filter. For full details of the warranties available and the terms and conditions please visit our website. **For the maximum total equivalent flue length please refer to the installation manual.


Keston hp BSEE Feb23.indd 1 Read the latest at: www.bsee.co.uk 19/1/23 12:08 BUILDING SERVICES & ENVIRONMENTAL ENGINEER FEBRUARY 2023 13


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