When a heated flooring system or radiator is installed, people usually care about the associated costs and how much will it be every month.
The answer depends on what kind of house you have: i.e., an energy saving or non-energy saving type. What about its degree of energy conservation?
First, let's talk about the principle of heating.A house itself will consume certain heat when the indoor temperature is high (e.g., 20℃) while the outdoor temperature is low (e.g., 0℃). When the house is provided with a heating system (floor heating, radiators or electrical floor heating), it will release certain heat. If the amount of released heat is greater than the amount of consumed heat, the temperature will be fixed at the design temperature, but if the former is less than the latter, the indoor temperature will be lower than the design temperature.
It is worth mentioning that when the heating system is not on, that is, the indoor temperature is close to the outdoor. For example, the indoor is 0℃ while the outdoor 5℃, thus the wall temperature will be about 5℃; when the heating system is on. First, the walls will begin to absorb heat. To nearly reach the design temperature (e.g., 20℃), that is, 15-18℃, the required heat is considerable, but after this point, the released heat is only needed to make up the consumed, reaching a balance, and the required heat is much less.So the heating cost depends on whether the house is energy-saving or not; furthermore, people usually think that the heating system can be turned off when getting out, but the walls begin to cool down from then, and when turning it on after coming back, the walls need to be warmed again slowly, thus wasting much heat on the walls.
This thought originates from air conditioners, which supply heat by blowing hot air. The areas within the blowing range will be warmed, but those off the range are still cold. When it is turned off, the room will cool down to the original temperature in several minutes, this is the heating principle of air conditioner, the same with the bath heating lamp. This kind of heating is not comfortable for users.
So the heating cost depends on whether the house is energy-saving or not; furthermore, people usually think that the heating system can be turned off when getting out, but the walls begin to cool down from then, and when turning it on after coming back, the walls need to be warmed again slowly, thus wasting much heat on the walls.
That is to say, it has to keep the heating system on all day regardless of whether there is anyone staying at home.
But for office workers, they normally are out at daytime and it will waste much energy. Indeed, based on practical experience and theoretical calculation, the way of keeping the floor heating system on all day is much economical than that of turning off when getting out and turning on after coming back. This is because, when the system is started, first the walls begin to absorb heat and the amount required is considerable, but after reaching the required point, the released heat is only needed to make up the consumed, reaching a balance, and the required heat is much less this time.
Of course, users may choose the more economical way, i.e., setting the water or indoor temperature to 13-15℃ and setting it to 18-20℃ when back. With this way, the temperature inside can be raised to 18-20℃ within 10 minutes. Although, for cold starting when back, at least two hours are needed for a suite of about 100m2 house and energy consumption is considerable.
But if there will be no one for the next several days, it is recommended to turn off the heating system and start it again when coming back.
Most of the southern people in China, including me, do not understand why I would spend so much on heating. In 2003, my house with a gross floor area installed a floor heating system during winter. The first day I started to use floor heating which consumed so much natural gas worth about 84 Yuan RMB within 24 hours, it is unbelievable. In this way, I have to pay about 2500 Yuan/ month for heating, which was really hard to me. Uneasy and worried, I got through that year by turning it off when going out and starting it on when getting back, thus making me very uncomfortable.
In 2004, I made a hard decision for the heating expense of 2500 Yuan per month, I accepted! . . . . . Keeping it on, always on... . . . . . Haha! I became very glad the next day, when the gas consumption was about 40 Yuan, and after three days, the expense per day was about 30 Yuan, wherein the heating system was kept on and set at about 20℃ for 24 hours a day. Afterwards, I found the highest monthly gas cost was just 1038 Yuan, including the part for my family's (five persons) showers and cooking, thus the expense of heating system per month was about 800 Yuan, and it will be lowered to 500-600 Yuan for a 100m2 house.
In addition to above factors, the heating expense also depends on usage habits. For example, opening the windows when the system is on, or setting it at over 22℃ (generally, the suitable temperature for comfort should be 18-22℃) will cause the expense raised.