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Types of Central Heating Radiators

The european-styled compact radiator is now UK's most popular radiator.

Compact radiators have all the benefits of the seamed top radiator (commonly referred to as STR) but have the extra benefit of factory fitted top grills and end panels making them more pleasing to the eye.

Stelrad Compact Radiator

 Although Inspired Heating Solutions can supply all styles of radiators, the following information is based upon the compact style radiator.
Compact Radiators are available in three styles, Click below to go to the relevant catalogue page:
K1 - Single Panel with Single Convector Single Panel Radiator with Single Convector
P+ - Double Panel with Single Convector Double Panel Radiator with Single Convector
K2 - Double Panel with Double Convector Double Panel Radiator with Double Convector

To work out which style is right for your room, you first need to calculate the output that is required.

The recommended Room Temperature is 21°C (70°F) for Living Rooms, Dining Rooms, and Bathrooms, and 18°C (65°F) for Bedrooms, Kitchens, Halls, and WCs.

Use the following chart to estimate the required output in either BTU's or Watts:

Room size to be heated

Heat Output Required 21°C

Heat Output Required 18°C
Watts
Btu/hr
177Btu/m³
Watts
Btu/hr
142Btu/m³

2.5m x 2m = 12.2m³
633

2160
508

1732

3m x 2.5m = 18.3m³
949

3239
762

2599

3m x 3m = 21.96m³
1139

3887
914

3118

3.5m x 3m = 25.62m³
1329

4535
1066

3638

3.5m x 4m = 34.16m³
1772

6046
1422

4851

4.5m x 4m = 43.92m³
2278

7774
1828

6237

4.5m x 5m = 54.9m³
2848

9717
2285

7796

5m x 6m = 73.2m³
3797

12956
3046

10394

6m x 6m = 87.84m³
4557

15548
3656

12473

These figures are based on ceiling height 2.44m (8ft.)

A 10% increase should be added to the required heat output each time one of the following applies.

  1. Exposed room – Northern aspect
  2. 2.74 (9ft.) Ceiling
  3. Very large window areas
  4. 3 Outside walls

The table is meant to be a guide only. It represents a fair, quick and easy way to access the heating requirements of a room. Actual needs will vary according to site conditions and may differ from the above. The radiator you require can be selected from charts contained within the web site taking into account height and length restrictions and allowing100mm (4 inches) clearance at either end of the radiator for access to valves.

Now you know what output is required from your radiators, you can use the following table to find which style and size is most suitable for your needs:
Height
Length (Approx)
Section
K1
P+
K2
mm
in
Watts
Btu/hr
Watts
Btu/hr
Watts
Btu/hr
300
500
1000
1500
2000
2500*
3000*
19.7
39.4
59.1
78.7
98.4*
118.1*
15
30
45
60
75
90
450
400
500
600
700
800
900
1000
1100
1200
1400
1600
1800
2000
2200*
2400*
2600*
2800*
3000*
15.7
19.7
23.6
27.6
31.5
35.4
39.4
43.3
47.2
55.1
63.0
70.9
78.7
86.6*
94.5*
102.4*
110.2*
118.1*
12
15
18
21
24
27
30
33
36
42
48
54
60
66
72
78
84
90
600
400
500
600
700
800
900
1000
1100
1200
1400
1600
1800
2000
2200*
2400*
2600*
2800*
3000*
15.7
19.7
23.6
27.6
31.5
35.4
39.4
43.3
47.2
55.1
63.0
70.9
78.7
86.6*
94.5*
102.4*
110.2*
118.1*
12
15
18
21
24
27
30
33
36
42
48
54
60
66
72
78
84
90
700
400
500
600
700
800
900
1000
1100
1200
1400
1600
1800
2000
2200*
2400*
2600*
2800*
3000*
15.7
19.7
23.6
27.6
31.5
35.4
39.4
43.3
47.2
55.1
63.0
70.9
78.7
86.6*
94.5*
102.4*
110.2*
118.1*
12
15
18
21
24
27
30
33
36
42
48
54
60
66
72
78
84
90
The radiator outputs in this guide have been derived from tests made with top bottom same end (TBSE) connections in conformity with the requitements of BS EN 442 2003 - current as of July 2003

* These longer length radiators are special order items - please email us for a price and details of delivery times.
Delivery is FREE on orders over £100 excluding VAT to most of the UK mainland with the exception of some Scottish regions.

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