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Sizing Guide
Storage and panel heaters
To use these tables, select the type of
heater and the appropriate sizing guide
table. Then read across from the nearest
floor area and appropriate external wall
length to where the columns intersect.
There are two temperature options given
in each table:
• Comfort - approximately 21°C for living areas
• Background - approximately 18°C, typically
required in bedrooms
Product Selector
Floor Temperature
Area m
2
Options
1.5m
2m
Up to
Comfort
S/XS
S
3m
2
Background
S/XS
S/XS
Up to
Comfort
S
M
6m
2
Background
S
S
Up to
Comfort
S
M
9m
2
Background
S
S
Up to
Comfort
M
M
12m
2
Background
S
M
Up to
Comfort
L
L
15 m
2
Background
M
M
Up to
Comfort
L
L
18m
2
Background
M
M
Up to
Comfort
L
L
21m
2
Background
M
M
Up to
Comfort
L
MS
24m
2
Background
M
L
Up to
Comfort
MS
MS
27m
2
Background
L
L
Up to
Comfort
2M
2M
30m
2
Background
L
L
Up to
Comfort
18
18
3m
2
Background
18
18
Up to
Comfort
18
18
6m
2
Background
18
18
Up to
Comfort
18
18
9m
2
Background
18
18
Up to
Comfort
18
18
12m
2
Background
18
18
Up to
Comfort
24
24
15m
2
Background
18
18
Up to
Comfort
24
24
18m
2
Background
18
18
Up to
Comfort
24
24
21m
2
Background
18
18
Up to
Comfort
24
24
24m
2
Background
18
24
Up to
Comfort
18+S 18+S
2
27m
Background
24
24
Up to
Comfort
18+M 18+M 18+M 24+M 24+M
30m
2
Background
24
24
Up to
Comfort
600
600
3m
2
Background
600
600
Up to
Comfort
600
1000
6m
2
Background
600
600
Up to
Comfort
1000
1000
9m
2
Background
1000
1000
Up to
Comfort
1250
1250
12m
2
Background
1000
1000
Up to
Comfort
1250
1250
15m
2
Background
1000
1250
Up to
Comfort
1500
1500
18m
2
Background
1250
1250
Up to
Comfort
1500
2000
21m
2
Background
1250
1500
Up to
Comfort
2000
2000
24m
2
Background
1500
1500
Up to
Comfort
2000
2000
27m
2
Background
1500
1500
Up to
Comfort
2250
2500
30m
2
Background
2000
2000
Extra Small (XS) = TSR6 = 0.9kW
Small (S) = TSR12 = 1.7kW
44
Choose either comfort or background
heating for the suggested heater size.
These tables are based on conventionally
constructed single or two storey
dwellings within:
• Ceiling heights of 2.5m (8ft)
• Roof insulation of 25mm (1in) thick
• Brick cavity walls with no insulation
• An external temperature of -1°C
Total Length of Outside Wall (m)
3m
4m
5m
6m
7m
8m
S
M
M
M
S
S
S
M
M
M
L
L
L
L
S
S
M
M
M
M
M
L
L
L
L
MS
M
M
M
M
M
L
L
L
L
MS
MS
MS
M
M
M
L
L
L
L
L
MS
MS
2M
2M
M
M
L
L
L
MS
L
MS
MS
2M
2M
2M
M
L
L
L
MS
MS
MS
MS
2M
2M
2M
LM
L
L
L
MS
MS
MS
MS
2M
2M
2M
LM
LM
L
L
MS
MS
MS
MS
2M
2M
2M
LM
LM
2L
L
MS
MS
MS
MS
2M
2M
LM
LM
2L
2L
2L
MS
MS
MS
2M
2M
2M
18
18
18
18
18
18
18
18
18
18
24
24
24
24
18
18
18
18
18
18
18
24
24
24
24
18+S
18
18
18
18
18
24
24
24
24
18+S
18+S
18+S 18+M 18+M 18+M 18+M
18
18
18
24
24
24
24
24
18+S
18+S
18+S
18+S 18+M 24+M 24+M 24+M
18
18
24
24
24
24
24
18+S 18+S
18+S 18+M
18+M 24+M 24+M
18
24
24
24
24
18+S
18+S
18+S 18+S
18+S 18+M
18+M 18+M 24+M 24+M 24+L
24
24
24
24
18+S
18+S
18+S
18+S 18+S
18+M 18+M
24+M 24+M 24+L
24
24
24
18+S
18+S
18+S 18+M 18+M 18+M 24+M 24+M 24+M
18+S
18+M 18+M 18+M 24+M
24+M 24+L
24
24
18+S
18+S
18+S
18+M 18+M 18+M 24+M 24+M 24+M 24+L
24+L
24+L
24+L
24
18+S 18+S
18+M 18+M
18+M 18+M 18+M 24+M 24+M
1000
1000 1250
1250
600
1000 1000
1000
1000
1250 1250
1500
1500
2000
1000
1000 1000
1250
1250
1500
1250
1250 1500
1500
2000
2000
1000
1250 1250
1250
1500
1500
1250
1500 1500
2000
2000
2000
1250
1250 1250
1500
1500
1500
1500
1500 2000
2000
2250
2250
1250
1500 1500
1500
2000
2000
2000
2000 2000
2250
2500
2500
1250
1500 1500
1500
2000
2000
2000
2000 2250
2250
2500
2500
1500
1500 2000
2000
2000
2000
2000
2250 2500
2500
2750
2750
2000
2000 2000
2000
2250
2250
2250
2500 2500
2750
3000
3000
2000
2000 2000
2000
2250
2500
2500
2500 2750
3000
3000
3250
2000
2000 2000
2250
2500
2500
Medium (M) = TSR18 = 2.5kW
+44 (0) 1733 456789
Technical Specification
Tables for storage and storage fan heaters also assume
the use of 7 hour economy tariff electricity.
Please check your tariff and metering requirements
with either your electricity supplier or call the Creda
Technical Centre on 08709 000430.
9m
10m
11m
12m
13m
14m
SM
2M
L
L
2M
2M
2M
LM
L
MS
MS
MS
2M
LM
LM
2L
2L
MS
MS
2M
2M
LM
LM
LM
2L
2L
2L
3M
MS
MS
2M
2M
2M
2M
LM
2L
2L
2L
3M
3M
MS
2M
2M
2M
2M
LM
2L
2L
2L
3M
3M
3M
2M
2M
2M
LM
LM
ML
2L
2L
2L
3M
3M
3M
2M
2M
LM
LM
LM
2L
2L
2L+S
2L+S
2L+S
2L+S 2L+M
2M
2M
LM
LM
2L
2L
18+S
18+S
24
24
24
18+S
18+S
18+S
24+L
18+S
18+S
18+S 18+M 18+M
24+L
24+L
24+L
24+L
18+S
18+S
18+M 18+M 18+M 18+M
24+L
24+L 18+2M 18+2M
18+S 18+M 18+M 18+M 24+M 24+M
24+L
24+L 18+2M 18+2M 24+2M 24+2M 24+2M
24+L
24+L 18+2M 18+2M 18+2M 18+2M 24+2M 24+2M
24+L 18+2M 18+2M 18+2M 18+2M 18+2M 24+2M 24+2M 24+2M 24+2L 24+2L 24+2L
24+L
24+L
2000
2250
2000
2000
2250
2500
2500
2500
2000
2000
2000
2000
2500
2500
2750
3000
3000
2000
2250
2500
2500
2500
2500
2750
3000
3000
3250
3500
2250
2250
2500
2500
2500
2500
2750
3000
3000
3250
3500
3500
2250
2250
2500
2500
2750
2750
3000
3000
3250
3500
3500
4000
2500
2500
2500
2750
2750
3000
3250
3500
3500
4000
4000
4000
2500
2500
2750
2750
3000
3000
3250
3500
3500
4000
4000
4000
2500
2750
2750
3000
3000
3250
Large (L) = TSR24 = 3.4kW
www.creda-heating.co.uk
15m
16m
17m
18m
19m
20m
3M
LM
3M
2L+S
LM
LM
2L+S
2L+S
2L+S
2L
2L
2L
2L+S
2L+S
2L+M 2L+M
2L
2L
2L
2L
2L+M 2L+M 2L+M
3L
3L
3L
2L
2L
2L
3M
3M
3M
24+L
24+M
24+M 24+M
24+L
24+L
24+L
24+L
24+L
24+L
24+L
24+L
24+L
24+L 18+2M 18+2M 18+2M
3500
2750
4000
4000
3000
3000
4000
4000
4000
3000
3250
3250
4100
4400
4400
4750
3250
3250
3500
3500
4100
4400
4400
4750
4750
5000
3250
3500
3500
4000
4000
4000
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