ᐅ Total Energy Demand of a New Building

Hello everyone,

I am interested in whether there is a formula or a practical way for a layperson to calculate or at least estimate the total energy demand (heating + hot water) of a house.

I am looking for the amount of energy the heating system ultimately needs to provide, so a figure that is independent of which heating system or heat pump will be used in the end.

It seems that the values from the energy performance certificate cannot be used for this purpose.

Take a look at SHK (Sanitary, Heating, and Air Conditioning). There are also several videos on this topic on YouTube.

There are rough calculators available for certain house construction years (heating demand). Otherwise, you could estimate which energy saving regulation/building energy law standard applied in that year and derive the heat energy demand from that.

Some online calculators only ask for the year of construction, number of occupants, and living area size.

From a purely physical perspective, the calculation would be: How much energy is required to heat x liters of water to a temperature of °C?

In our calculation, the warm building envelope (indoor temperatures) was compared to a cold average outdoor temperature, and the total heat losses resulted in the heating energy demand.

klausdieter73 schrieb:

Apparently, the values from the energy performance certificate cannot be used for that.

If there is an energy performance certificate, then the house is either a new build—with a calculated assessment—or an existing building, where data from previous usage is available.

All personal calculations are only as accurate as any estimate based on the energy performance certificate. Especially if you don’t actually know what materials or components were installed.