If you are considering purchase of a new appliance/device, this calculator can help you. It evaluates whether it is worth to buy the appliance/device you are interested in at the seller's price and what benefit you would get. You can also use this calculator to find out a maximum (break-even) price, below which you would still benefit from buying the appliance/device. If you do not have an old appliance/device of the same class/type/purpose and it is completely new in your household, the most likely benefit/loss due to the purchase will be calculated against the most common, statistically average situation. Before calculation, you will be asked to make several choices of parameters of the appliance/device you are interested in. Click "Calculate" to start calculation. If you do not want to calculate, click "Exit". Button "Administrator" is intended for administrative functions only.
Select ONE group out of all listed groups of Heating & Cooling equipment and Household appliances:
Heating & Cooling equipment
Heat pumps "Air-air (ACs)"
Heat pumps "Air-water"
Heat pumps "Ground-water (Geothermal)"
Electric water boilers
Gas water boilers
Combined water boilers
Solar water heaters
If you want to purchase a new device/appliance in order to replace the old device/appliance of the same class/type/purpose currently being used in your household, fill in the data about the old device/appliance.
If you do not have the old device/appliance of the same class/type/purpose, skip this form and click "Next".
Enter data about the OLD device/appliance into white fields:
Has been used for
Annual consumption of
If you have not entered annual consumption data, a statistical average will be used.
How often it has been repaired? (choose one option):
Enter data about the NEW device/appliance into white fields:
Annual consumption of
Quality difference due to other criteria, compared with the OLD device/appliance:
Assume that the price of the old device/appliance at the beginning of its use was 100%. If the old and new items were equal in terms of the capacity, volume etc. and annual energy/fuel consumption, how much would you pay for the new item with respect to its other features: appearance, design, ease of use and other individual criteria?
If you are unsure or irrelevant about the quality difference determined by the other criteria, leave the initial value of 100%. Use arrows to select the price that reflects the quality (in percentage).
Price of the new device/appliance:
If you do not enter the price, a break-even price still will be calculated.
Replacement of the old device/appliance by the new one will produce benefit (loss, if minus):
(Net present value over a lifetime of the new device/appliance.)
If replaced now:
If replaced after
years, when a full lifetime of the old device/appliance has ended:
Calculated for the case "replaced now".
1) Calculation does not include installation costs. Note that household appliances have no associated installation costs.
2) The figure "If replaced now" provides maximum margin for still acceptable installation costs (if relevant).
3) Calculation was done at energy/fuel price as in the white field below.
4) You may wish to repeat calculation at a different energy/fuel price. To do this, change the energy/fuel price then click "Back" and "Calculate".