Dimplex Heater Sizing Chart
All information is subject to change
Dimplex North America Limited • 1367 Industrial Road • Cambridge, ON N1R 7G8
Model
Heating
Elements
Maximum Maintainable Heat Loss
1
kW (BTU/Hr)
Wire
Size
2
Breaker
Size
3
(total)
8+0
10+0
12+0
(AWG)
(Amps)
VFMQ40
-440
4.0 kW
1.8 kW
(6,150)
1.9 kW
(6,490)
2.1 kW
(7,150)
#10/2
30
VFMQ50
-550/564
5,0 or
6.4 kW
2.3 kW
(7,850)
2.6 kW
(8,900)
2.8 kW
(9,550)
#10/2
#8/2
30/40
VFMQ60
-660/676
6.0 or
7.6 kW
2.7 kW
(9,200)
3.0 kW
(10,250)
3.3 kW
(11,250)
#8/2
40
VFMQ70-
770/790
7.0 or
9.0 kW
3.1 kW
(10,600)
3.4 kW
(11,600)
3.7 kW
(12,600)
#8/2
#6/2
40/50
VFMQ30
-330
3.0 kW
1.3 kW
(4,440)
1.5 kW
(5,120)
1.7 kW
(5,800)
#12/2
20
VFMQ20
-220
2.0 kW
0.9 kW
(3,070)
1.0 kW
(3,410)
1.1 kW
(3,750)
#14/2
15
To properly size a heater installation and ensure that the homeowner is comfortable and
never runs out of stored heat, two variables must always be taken into account:
1) the heat loss of the room on the coldest day of the year;
2) the length of the Utility’s Off-Peak period.
As an example, let’s assume that your room has a heat loss of 2 kW (7,000 BTU/Hr) and your Off-
Peak period has a duration of 8 hours, overnight from 11pm to 7am. Looking at the column below
under “8 hours”, the VFMQ40-440 storage heater can meet a maximum maintainable heat loss of
1.8 kW, while the next larger size can meet 2.3 kW, so the VFMQ50-550 is the correct choice.
Steffes Simple Cross Reference
1
Maximum Maintainable Heat Loss refers to the maximum heat loss each storage heater can meet
based on the local electrical utility’s charging schedule.
2
Wire and Breaker sizes should be confirmed based on the local electrical code.
•
This table is a simple cross-reference for Steffes
room units.
•
Please note that these tables do not replace the need
for a proper heat loss.
www.renewables.dimplex.com
Steffes
Dimplex
2103
VFMQ40
2104
VFMQ50
2105
VFMQ60
2106
VFMQ70
2102
VFMQ30
