Storage Heater Selection Table

To choose the correct storage heater for your room, you will need to know the room’s heat loss and the duration of your Electric Utility’s off-peak period.

As an example, let’s assume that your room has a heat loss of 2 kW (7k BTU/Hr) and your off-peak period has a duration of 8 hours, from 11 p.m. to 7a.m.

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 to meet your room’s 2.0 kW heat loss.

Choose your region: Minnesota | Nova Scotia | Rural Electric Cooperatives | Ontario

Minnesota Power, USA

Model

Element

Maximum Maintainable Heat Loss1
based on Minnesota Power’s Off-Peak period

Wire Size2

Breaker Size2

 

Wattage

8 hours

(AWG)

(Amps)

VFMQ20

2 kW

0.9 kW
3,070 BTUH

#14/2

15

VFMQ30

3 kW

1.3 kW
4,440 BTUH

#12/2

20

VFMQ30

4 kW

1.8 kW
6,150 BTUH

#10/2

30

VFMQ50

5 kW or 6.4 kW

2.3 kW
7,850 BTUH

#10/2 or #8/2

30 or 40

VFMQ60

6 kW or 7.6 kW

2.7 kW
9,200 BTUH

#8/2

40

VFMQ70

7 kW or 9 kW

3.1 kW
10,600 BTUH

#8/2 or #6/2

40 or 50

  1. Maximum Maintainable Heat Loss refers to the maximum heat loss each storage heater can meet based on the length of your utility’s off-peak period.
  2. Wire and Breaker sizes should be confirmed based on your local electrical code.
  3. If your Electrical Utility offers a mid-peak period as well, please for a customized storage heater selection table.

Nova Scotia, Canada

Model

Element

Maximum Maintainable Heat Loss1
based on Nova Scotia Power’s TOD rate structure

Wire Size2

Breaker Size2

 

Wattage

Nova Scotia Power3
8 + 4

Manual4
8 + 0

(AWG)

(Amps)

VFMQ20

2 kW

1.1 - 1.4 kW

0.8 - 0.9 kW

#14/2

15

VFMQ30

3 kW

1.7 - 2.1 kW

1.2 - 1.4 kW

#12/2

20

VFMQ40

4 kW

2.1 - 2.7 kW

1.6 - 1.8 kW

#10/2

30

VFMQ50

5 kW

2.8 - 3.7 kW

2.1 - 2.3 kW

#10/2

30

VFMQ60

6 kW

3.4 - 4.3 kW

2.5 - 2.7 kW

#8/2

40

VFMQ70

7 kW

3.8 - 4.7 kW

2.8 - 3.1 kW

#8/2

40

  1. The Nova Scotia Power column assumes the use of the Dimplex control panel and the intelligent use of the additional 4-hour mid-peak standard rate period.
  2. When using a manual control strategy, the mid-peak standard rate period is not used for charging and therefore the lower heating capacity must be used.

Rural, Rural Electric Cooperatives

Model

Element

Maximum Maintainable Heat Loss1
based on the length of your Off-Peak period3

Wire Size2

Breaker Size2

 

Wattage

8 hours

10 hours

12 hours

(AWG)

(Amps)

VFMQ20

2 kW

0.9 kW
3,070 BTUH

1.0 kW
3,410 BTUH

1.1 kW
3,750 BTUH

#14/2

15

VFMQ30

3 kW

1.3 kW
4,440 BTUH

1.5 kW
5,120 BTUH

1.7 kW
5,800 BTUH

#12/2

20

VFMQ40

4 kW

1.8 kW
6,150 BTUH

1.9 kW
6,490 BTUH

2.1 kW
7,150 BTUH

#10/2

30

VFMQ50

5 kW or 6.4 kW

2.3 kW
7,850 BTUH

2.6 kW
8,900 BTUH

2.8 kW
9,550 BTUH

#10/2 or #8/2

30 or 40

VFMQ60

6 kW or 7.6 kW

2.7 kW
9,200 BTUH

3.0 kW
10,250 BTUH

3.3 kW
11,250 BTUH

#8/2

40

VFMQ70

7 kW or 9 kW

3.1 kW
10,600 BTUH

3.4 kW
11,600 BTUH

3.7 kW
12,600 BTUH

#8/2 or #6/2

40 or 50

 

Ontario, Canada

Model

Element

Maximum Maintainable Heat Loss1
based on Ontario's TOU rate structure

Wire Size2

Breaker Size2

 

Wattage

Ontario TOU3
12 + 6

Manual4
12 + 0

(AWG)

(Amps)

VFMQ40-440

4 kW

3.0 kW

2.1 kW

#10/2

30

VFMQ50-550

5 kW

4.1 kW

2.8 kW

#10/2

30

VFMQ60-660

6 kW

4.7 kW

3.3 kW

#8/2

40

VFMQ70-770

7 kW

5.0 kW

3.7 kW

#8/2

40

  1. Maximum Maintainable Heat Loss refers to the maximum heat loss each storage heater can meet based on the length of Ontario's charging periods.
  2. Wire and Breaker sizes should be confirmed based on your local electrical code.
  3. The Ontario TOU column assumes the use of the Dimplex control panel and the intelligent use of the additional 6-hour mid-peak standard rate period for only the coldest days.
  4. When using a manual control strategy, the mid-peak period is not used for charging and therefore the lower heating capacity must be used.