Stelrad Heat Loss Programmes
Stelrad offer a basic and advanced heat loss programme to help calculate the BTU (British Thermal Unit) requirement, needed to heat your room or project.
Both the basic and advanced heat loss programmes are online platforms, so you can login from anywhere and access your account. All your previous project will be stored and can be easily duplicated, saving you time and hassle.
Basic Heat Loss Programme
Use this heat loss calculator for a quick estimate of how much heat you need for your room or project.
The Stelrad basic heat loss calculator makes various assumptions based on your choices and may not take into account all factors relating to your particular requirements. If you require a more detailed calculation please use the advanced version of the programme at starsapp.co.uk. We accept no liability for any errors resulting from the estimates given. Calculations are based on Delta-T 50°C (Δ-T50°C) in accordance with BS EN 442. Your use of the Stelrad basic heat loss calculator is subject to these terms and conditions.
STARS Advanced Heat Loss Programme
STARS (Stelrad Technically Advanced Radiator System) is an online heat loss programme designed by Stelrad for anyone who needs to calculate heat loss for a room, so as to choose the correct heating requirements.
Use this heat loss programme for a comprehensive calculation which you can enter all your parameters that affect heat loss in your room.
The advanced heat loss programme takes the user through a simple step-by-step process of inputting key information for any room type including the wall, floor and ceiling dimensions, choosing wall materials and door and window types. It enables instantaneous heat loss calculations using the unique room planner where you can simply drag the walls and calculate the output figure in real time.
Once the room specification is completed the heat loss programme suggests a selection of appropriate radiators from Stelrad’s product portfolio. A product can then be selected to replace heat lost from the room. STARS will also calculate the heating requirements for an entire building and suggest appropriate boilers (combi or heat only).
A radiator schedule and boiler specification can then be printed or saved.
Additional terms and conditions:
Basic Heat loss Assumptions
The assumptions made in the basic heat loss programme are as follows:
Interior walls are treated as party walls with an adjacent temperature of 10°C
Interior walls have a u value of 1.5
Interior walls include a single internal door measuring 1.98m x 0.76m and u value of 2.2
A floor type other than “Heated Room” assumes an adjacent temperature of -3°C
A ceiling type other than “Heated Room” assumes an adjacent temperature of -3°C
External temperature is -3°C
Bathroom – Temperature: 22, Air Changes: 2
Bedroom – Temperature: 18, Air Changes: 1
Bedroom/En Suite – Temperature: 18, Air Changes: 2
Dining Room – Temperature: 21, Air Changes: 1.5
Hall – Temperature: 18, Air Changes: 1.5
Kitchen – Temperature: 18, Air Changes: 2
Kitchen/Diner – Temperature: 21, Air Changes: 2
Landing – Temperature: 18, Air Changes: 1.5
Living Room – Temperature: 21, Air Changes: 1.5
Study – Temperature: 21, Air Changes: 1.5
Utility Room – Temperature: 18, Air Changes: 2
WC – Temperature: 18, Air Changes: 2
Exterior Wall Types
220mm solid brick plastered – U Value: 2.10
105mm solid brick plastered – U Value: 3.00
Brick cavity wall – U Value: 1.47
Insulated brick cavity wall – U Value: 0.50
Timber frame wall – U Value: 0.29
Wood/PVCu Single Glazed – U Value: 5.0
Wood/PVCu Double Glazed – U Value: 2.9
Low E Double Glazed – U Value: 1.7
Metal Frame Single Glazed – U Value: 5.8
Heated room – U Value: 1.36, Adjacent Temperature: 21
Timber floor over ventilated air gap – U Value: 0.82, Adjacent Temperature: 10
Uninsulated solid floor on earth – U Value: 0.82, Adjacent Temperature: 10
Solid concrete floor – U Value: 1.6, Adjacent Temperature: 10
Heated room – U Value: 1.62, Adjacent Temperature: 18
Insulated roof space – U Value: 0.71, Adjacent Temperature: -3
Uninsulated roof space – U Value: 2.30, Adjacent Temperature: -3
Insulated flat roof – U Value: 0.70, Adjacent Temperature: -3
Uninsulated flat roof – U Value: 2.19, Adjacent Temperature: -3
Room has 1 exterior wall – assume the exterior wall is the longer.
Room has 2 exterior walls – assumes the two exterior walls are at right angles.
Room has 3 exterior walls – assumes the exterior walls are two short and one long.
Images and descriptions on the website
The physical dimensions of the radiators stated on our Heat Loss Programmes are indicative only. Although we have made every effort to state accurate dimensions, we cannot guarantee that your radiators will match those dimensions exactly. To the extent permitted by law, we accept no liability associated with such variations.
The images of the radiators on our Heat Loss Programmes are for illustrative purposes only. Although we have made every effort to display the colours accurately, we cannot guarantee that your device’s display of the colours will accurately reflect the colour of the radiators. Your radiators may vary slightly from those images. Radiators may show some colour variation. To the extent permitted by law, we accept no liability associated with such variations.
Other important terms
We may update, vary and amend these assumption and Terms from time to time without prior notice. Each time you use the programmes, the assumptions used at that time will apply.