Floor surface temperatures when fitting underfloor heating

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  Max Floor Surface Temp °C Design Room Temp °C Heat Emission (floor output) W/m2
Occupied
Area
29 20 100
Peripheral
Area
35 20 175
Bathroom
Wet Area
33 24 10

Table 1 - Floor Surface Temperatures

4.1    Ceramic Floor Tiles

Ceramics work well with underfloor heating. They have a nil or very low TOG value and offer very little thermal resistance to heat transfer.   
To avoid cracking of the tiles flexible adhesive and grout should be used.  Check that the adhesive and grout is suitable for use with underfloor heating.

4.2    Carpets

Carpet and underlay have a higher TOG value. The thicker the carpet and underlay the TOG value and the greater resistance to heat transfer.
Be careful when choosing underlay as their insulation properties reduce the heat output
of the floor.  Make sure underlay it is suitable for underfloor heating
If carpet adhesive is to be used, make sure it is suitable for temperatures up to 40°C.  If gripper rails are used make sure you don't nail to deep and puncture the pipes!

4.3    Plastic/Vinyl Tiles

Plastic floors tiles and coverings generally work well.  They have a low TOG value and
offer very little thermal resistance to heat transfer.
It is important to check with the retailer or manufacturer that the covering and adhesives are suitable for use with underfloor heating

4.4    Timber/Wooden Floors

Timber floor coverings work well with underfloor heating However, as a natural material, it is important to follow the recommendation of the floor manufacturer regarding installation and initial start up. Timber floors should generally not have a moisture content greater than 10%.
When installing with a screeded floor the screed must be fully cured before the covering is installed. Following curing the system should be run for approximately 2 weeks with the materials in the area before installation occurs. This reduces the moisture in the area and allows the material to acclimatise.
We advise that specific information should be obtained from the proposed covering supplier or manufacturer to assess the suitability of the covering for underfloor heating.

Table 3 Ceramic Tiles

R-value 0.00m2K/W (0.0TOG)

Maximum floor temperatures

Occupied areas         = 290C

Bathrooms                  = 330C

Peripheral areas       = 350C    

Output tables to BS EN1264 specification UFH1 16mm OD PE-RT pipes in 75mm floor screed (50mm coverage above pipes).

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
35


18
20
22
24

104           27
92             28
79             29
66             30       
89              26
79              27
68              28
57              29
77              25
68              26
59              27
49              29
59              23
52              25
45              26
38              28

 

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
40


18
20
22
24

135           28    
123           30    
110           31    
98             32   

116            28
105            29
95              30
84              31

101            27
92              28
83              29
73              31
77              25
70              26
63              28
55              29

 

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
35


18
20
22
24


166           30
154           31
141           32
129           33


143            30
132            32
121            33
111             34


124            29
114            30
105            31
96              33


94              26
87              28
80              29
73              31


Table 4 Parquet floor

R-value 0.05m2K/W (0.5TOG)                

Maximum floor temperatures

Occupied areas        = 290C

Bathrooms                 = 330C

Peripheral areas       = 350C    

Output tables to BS EN1264 specification UFH1 16mm OD PE-RT pipes in 75mm floor screed (50mm coverage above pipes).


Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
35


18
20
22
24


78             25
69             26
59             28
50             29


68              24
60              26
52              27
44              28

61               24
54               25
46               26
39               28

48              22
42              24
37              26
31              27

 

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2     (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2      (°C)
35


18
20
22
24

101           27
92             28
88             29
73             31

89              26
81              27
73              29
64              30


79              25
72              27
64              28
58              29


63              24
57              25
51              27
45              28

 

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
35


18
20
22
24


124          29
115          30
105          31
96            33


109            28
101            29
93              30
85              32


97              27
90              28
83              29
76              31


86              25
77              26
72              28
65              29

 

Table 5 Carpeted floor

R-value 0.10m2K/W (1.0TOG)                 

Maximum floor temperatures

Occupied areas        = 290C
 
Bathrooms                 = 330C

Peripheral areas       = 350C   

Output tables to BS EN1264 specification UFH1 16mm OD PE-RT pipes in 75mm floor screed (50mm coverage above pipes).


Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
35


18
20
22
24


62             24
55             25
48             27
40             28


55              23
49              25
42              26
35              27


50              23
44              24
38              26
32              27


41              22
41              22
31              25
26              27

 

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
40


18
20
22
24


80             25
73             27
66             29
58             30


72              25
65              26
59              28
52              29


65              24
59              26
53              27
47              28


53               23
48               25
43               26
38               28

 

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
45


18
20
22
24


99             27
91             28
84             30
77             31


88              26
82              27
75              29
69              30


80              25
74              27
68              28
62              29


65              24
60              28
55              27
50              29

 

Table 6 Deep pile carpet, wood floor

R-value 0.15m2K/W (1.5TOG)

Occupied areas        = 290C

Bathrooms                 = 330C

Peripheral areas       = 350C   

Output tables to BS EN1264 specification UFH1 16mm OD PE-RT pipes in 75mm floor screed (50mm coverage above pipes).

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
35


18
20
22
24

52             23
45             24
39             26
33             27

47              22
41              24
36              25
30              27


43              22
38              24
37              25
28              27

36              22
32              23
28              25
23              26

 

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
40


18
20
22
24


67             24
61             26
55             27
48             29


61              24
56              25
50              27
44              28


56              23
51              25
47              26
40              28


47              22
43              24
38              26
34              27

 

Mean water
temperature
MWT
(°C)
Target Room
Temp
TR
(°C)   
Pipe Spacing
100mm

W/m2      (°C)
Pipe Spacing
150mm

W/m2       (°C)
Pipe Spacing
200mm

W/m2       (°C)
Pipe Spacing
300mm

W/m2       (°C)
45


18
20
22
24


82             25
76             27
70             29
64             30


75              25
70              26
64              28
58              29


69              24
64              26
58              27
54              29


58              23
54              25
49              27
45              28


For more information contact Underfloor Heating 1 today.

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Floor Surface Temperature, Ufh, Electric Underfloor Heating, Underfloor Heating, Wet Underfloor Heating
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