{"id":1522,"date":"2026-03-22T21:15:48","date_gmt":"2026-03-22T21:15:48","guid":{"rendered":"https:\/\/mywarmhome.co.uk\/stage\/?p=1522"},"modified":"2026-05-09T07:04:14","modified_gmt":"2026-05-09T07:04:14","slug":"system-design-and-sizing","status":"publish","type":"post","link":"https:\/\/mywarmhome.co.uk\/stage\/2026\/03\/22\/system-design-and-sizing\/","title":{"rendered":"Understanding Design and Sizing of Our Heating Systems.."},"content":{"rendered":"\n
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True affordability is not achieved by cutting corners or reducing upfront costs alone,<\/h1>\n\n\n\n

Designing any heating or renewable system\u2014whether it\u2019s a heat pump, electric storage, gas boiler, unvented system, underfloor heating, radiator configuration, must begin with a single guiding principle: efficiency comes first.<\/p>\n<\/div>\n<\/div>\n\n\n\n

True affordability is not achieved by cutting corners or reducing upfront costs alone, but by designing systems that perform at their highest potential. When efficiency leads the design, it naturally shapes long-term affordability\u2014lower energy use, reduced running costs, and greater overall value.<\/p>\n\n\n\n

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In essence, affordability should never dictate efficiency; rather, efficiency should define affordability.<\/p>\n<\/blockquote>\n\n\n\n\n

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The Science.<\/h2>\n\n\n\n
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We\u2019re human\u2014and often stubborn. It\u2019s natural to trust what we can see and what we believe, even when the science tells a deeper story.<\/p>\n\n\n\n

But when it comes to our homes and keeping them warm, the science is vast and uncompromising. Facilities like the Energy House in Salford<\/a> constantly test and thermally model real-world conditions, while manufacturers subject materials to extremes of heat and cold to understand exactly how they retain or lose energy.<\/p>\n\n\n\n

Before any legitimate product reaches the market, it undergoes rigorous testing and must achieve strict certification standards\u2014whether UK or European. Only then is it assigned performance values, allowing it to be accurately modelled within properties and used to meet UK regulations.<\/p>\n\n\n\n

In short, what may seem simple on the surface is backed by an immense depth of science, testing, and proven performance.<\/p>\n\n\n\n

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Sizing For Our Homes.<\/h2>\n\n\n\n

When a new heating system or existing one is being specified or upgraded there are many factors to take into consideration. When I first started as a heating engineer it would be standard to go to a plumbers merchand and order a combi and 5 radiators as a standard heatpack which is no way to size for a property.
Lets look at some examples of how we would size a property for heating. We will discus hot water requirements later. <\/p>\n\n\n\n

Electric storage heaters can be hard to correctly size as they use stored cheaper overnight energy to heat properties during the day, things like work patterns, occupation and social factors like pre payment meters can all play a part. <\/p>\n\n\n\n

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For the next section we are looking at primary heating using gas or heat pumps.<\/p>\n<\/blockquote>\n<\/div>\n\n\n\n

Heat Loss. <\/h2>\n\n\n\n

Are we robbing Peter to pay Paul\u2014or neither? It\u2019s a great expression, especially when you think of it in heating terms: are we unintentionally drawing warmth from our neighbours, if we even have any?<\/p>\n\n\n\n

Understanding heat loss starts with the basics\u2014identifying losses through walls and floors, considering the size of the property, and defining the level of heat demand required through radiators etc. Once we understand our heat loss not only do we understand our radiator positions (underfloor obvious) but also the optimum balance of energy use to comfort levels.<\/p>\n\n\n\n

We calculate our heating requirement by looking at room sizes, then adjusting it based on how well our homes holds heat.
Older homes, poor insulation, and exposed walls increase heat loss \u2014 while insulation and neighbouring properties reduce it.<\/p>\n\n\n\n

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Q<\/mi>=<\/mo>V<\/mi>\u00d7<\/mo>F<\/mi>\u00d7<\/mo>M<\/mi><\/mrow>Q = V \\times F \\times M<\/annotation><\/semantics><\/math><\/p>\n<\/blockquote>\n\n\n\n

Q = Heat required (Watts)<\/strong>
This is the size of heating you need.<\/p>\n\n\n\n

V = Room Volume (m\u00b3)<\/strong>
Length \u00d7 Width \u00d7 Height.<\/p>\n\n\n\n

F = Base Heat Loss Factor (from property age)<\/strong>
Older homes lose more heat.<\/p>\n\n\n\n

M = Modifiers (construction, insulation, exposure, etc.)<\/strong>
Adjusts for real-world conditions.<\/p>\n\n\n\n

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Heat Loss & Heating Design Tool<\/h2>\n <\/div>\n\n
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\n Indoor temp<\/small>\n \n <\/div>\n\n
\n Outdoor temp<\/small>\n \n <\/div>\n\n
\n System type<\/small>\n