Energy savings calculator

Calculate your energy savings potential easily and quickly:

The approximate glass surface of your house in m² :
Reference value: single-family house approx. 25 m²
 Your present glazing:
Please enter value which corresponds to your status quo:
Reference value: single glass 5.8 W/m²K
conventional double glazing: 3.0 W/m²K
(Attention: point in place of comma!) W/m²K
Your planned glazing
Reference values: coated insulating glass (thermo-glass) 1.7 - 1.1 W/m²K
coated 3-panel Iso-glass 0.8 -0.6 W/m²K
Current price of heating oil
in euro/liter
The formula needs a point as separator for comma values !

 Heating oilMoneyCO2
possible savings per annum with modern double glazing0.00 liter0.00 euro0.00 kg
Possible savings per annum with optimal triple glazing0.00 liter0.00 euro0.00 kg

The savings in heating oil are calculated according to the following formula: E=[(Ua-Un)x F x G x 1.19 x 24]/[H x W]=I/HP
The symbols have the following meanings:
UaU- Value for your present window with single glass panel 5.8 W/m²K
for conventional (uncoated) insulating glass 3.0 W/m²K
for the sake of simplicity only the glass value is used
UnU- Value of current double glazing thermo-glass 1.1 W/m²K
for coated triple-panel-Iso-glass up to 0.6 W/m²K
FGlazing surface area in m²
G"Heating level days" according to DIN V 4108-6
(differs by region; an average value for the Federal Republic of Germany is 3600)
1,19Conversion of kilograms to liters (1 kg heating oil = 1.19 liters)
HCalorific value of the fuel used: for light heating oil approx. 11,800
WEfficiency of the heating plant: approx 0.75 for oil heating
HPheating period
Burning 1 liter of heating oil emits approx. 2.7 KG CO² - and the same amount is saved for every liter of heating oil which is not burned!
Increases in energy prices are not included in this formula. . Experts have forecast an increase of between 5 to 20 % per annum over the next few years.
The results of the savings calculator only give approximations and cannot take into account all the variables of individual cases. We can therefore not accept any liability for possible errors.