Family home in Velká Bystřice near Olomouc

A FENIX Jeseník reference building at which operating costs have been monitored on a long-term basis. Electric underfloor heating – ECOFLOOR heating cables and BMR central regulation – are installed throughout the house.
The family home in Velká Bystřice near Olomouc has a living area of almost 200 m2.
A double garage for two cars is connected to the house.
The user mainly still has work to do in the area around the house now – completion of fencing, the garden behind the house.
More than half of the living space on the ground floor consists of an interconnected kitchen, dining room and living room.
The rooms on the second floor create a private zone for the individual members of the household.
The electric underfloor heating is hidden in the floor, and thus the only visible source of heat in the room is the wood-burning stove.
The underfloor heating pleasantly heats the tiles and creates the necessary thermal comfort in the bathroom, though towels cannot be dried on it. The users are thus planning to add a ladder radiator.
A spacious walk-in closet is included in the bedroom, separated from the sleeping area by a lightweight partition.
ECOSUN 600 U+ ceiling panels were chosen for heating the garage. They currently cover only half of the planned wattage. However, if necessary, due to the surface wiring, it will be very easy to add another panel or two.
The heating in the whole house is controlled by BMR central regulation, which independently maintains the set temperature in each room. The regulation system has semiconductor switching – the absence of physical contacts means that not only does it operate in absolute silence, but it also has a practically unlimited service life.
One of the advantages of a central regulation system is that air temperature sensors can be inserted into any frame, and so they have the same design as the switches and sockets. For example, green and yellow frames were chosen for the children´s room to create a lively impression.
In contrast, an unobtrusive combination of grey and white was chosen for the switches and the temperature sensor in the corridor.

A two-storey family home in Velká Bystřice near Olomouc has been occupied by a family with two small children since 2018. The size of the house is above-standard, featuring 258.6 m2 of useable area - including a heated garage. The living area is completely heated using electric underfloor heating.

Basic information about the building

It is a two-storey family home without a basement; the living quarters have a total floor area of 197.8 m2. The ground floor is dominated by a large living room with a dining area, which is connected to the kitchen. There is also a separate room, a study and a bathroom on the ground floor. On the first floor, there is a bedroom, children´s rooms and a second bathroom. There are floating floors throughout the house and ceramic tiling in the WC. The adjacent spacious double garage, which also serves as a workroom, has an area of 60 m2.

  • Built-on area 198,4 m2
  • Heated area (incl. garage) 258,6 m2
  • Living area 197,8 m2
  • Main circuit breaker 3x 25 A
  • House tariff D 57D

Heating and regulation system

Electric underfloor heating using ECOFLOOR heating cables was chosen for the heating of the whole house, controlled by BMR central regulation. Hot water is heated in a 200 dm3 central storage heater with a 2.2 kW heating element. In the future, electric ladder radiators will be installed in the bathrooms as towel and bath towel dryers. The garage is heated by two ECOSUN 600 W ceiling panels.

  • Heat loss from the living area 7,6 kW
  • Underfloor heating wattage 11,3 kW
  • Heat loss from the garage 2,3 kW
  • Wattage of the ceiling panels 1,2 kW
  • Wood-burning stove in the living room 4 kW

The wattage of the underfloor heating in the living area is, relatively speaking, significantly higher than one would expect in the light of the calculated heat losses. The reason was the user´s requirement that underfloor heating be installed across the entire floor area so that the floor can be heated evenly. The overdimensioned floor heating is thus characterized by better dynamics, yet it has no negative effects. The accurate BMR central regulation system controls the temperature in each room with high accuracy so there is no unnecessary waste of energy.

In contrast, only two ceiling panels were installed in the garage, so only about 50% of the calculated losses were covered. This appears to be sufficient for the user, even after the first heating season, but the possibility of adding 1-2 more exists if needed.

The value of the main circuit breaker, 3 x 25 A, is also remarkable. It was mainly achieved thanks to the careful distribution of load in the individual phases. As a result, the originally planned BMR HJ 306RX current limiter was not installed in the end.

Acquisition and operating costs

The material costs of the heating equipment and central regulation system amounted to 82.2 thousand CZK, excluding VAT. The user carried out the installation of the heating largely on his own, but the price of the installation can be estimated at approximately 40-50 thousand CZK. In the case of a "turnkey" order, the price of the whole heating system, including the regulation system, would be approximately 130 thousand CZK, excluding VAT.

In the living room on the ground floor, i.e. the largest room in the whole house, there is a built-in wood-burning stove with a wattage of 4kW. There are no distribution systems to convey the warm air to other rooms. As the user says, the stove is used only sporadically, in the range of "1-2 briquettes for an evening, just to create a pleasant atmosphere". They estimated that they spent 1000 CZK on wooden briquettes during the 2020/2021 heating season.

The electricity costs listed in the table below thus include not only heating, but also water heating, lighting and the operation of all household appliances. The cost of the wooden briquettes mentioned above is not included. The house began to be used in October 2018, but due to the finishing work that was still taking place at the time, the direct-heating tariff was not allocated until February 2019. For more than half of the heating season, the electricity was charged at a high tariff. In the following billing period, which already took place with the D57 tariff, the consumption at the high tariff dropped dramatically and transferred to the low tariff (LT).

 

Period Consumption CZK including VAT
HT (kWh) LT (kWh)
10/2018 - 10/2019 4 183 4 926 39 624,-
10/2019 - 10/2020 8 444  406 30 996,-
10/2020 - 10/2021 9 938  489 35 560,-
10/2021 - 10/2022 7 328  418 28 410,-

Attached files

The bill for 2019/2020 can be downloaded here...
The bill for 2020/2021 can be downloaded here...
The bill for 2021/2022 can be downloaded here...

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