An adjustable heating output is recommended to ensure that the desired temperature can be maintained if the outside temperature changes.

Examples for variable heating are amongst others.

• Heated gloves with > 25 Watts which can be worn during colder and milder temperatures.
• Heated clothing that are used in instances where there is a headwind (the wind chill factor makes you feel the cold a lot more)
• Heat mats that are used for the coldest conditions.
• For people who are  looking for comfort, who are sensitive to cold temperatures, animals as well and
• General heating products that are used in conjunction with supply voltage (such as technical divers with NiCad batteries)     

In most cases it is possible to change the heating control at a later date.