the what and the how

by Sandra B.

The Central Heating

The central heating consists of several components installed by several suppliers and us: Dätwyler Offen AG, e-on Service, Wyss Sanitär Heizung GmbH.

Main Components:

1. Wood heating stove develop by Pertinger (100 Plus) -  Delivered and installed by Dätwyler Offen AG

2. Buffer storage tank from Hafnertec of 1000 liters  - Delivered and installed by Dätwyler Offen AG

3. Solar panels system - Delivered and installed by e-on service

4. Clay climate panels - Delivered by Stroba Naturbaustoffe AG. Installed by us

About the components

1. Pertinger 100 Plus - Heating Stove

It is a stove in which one can cook, bake, and heat at the same time.

The wood stove is located in the kitchen. When is used, we use the stove for cooking instead of the normal electrical kitchen. This way, we save energy and money. The stove became the main element in the kitchen, and the entire concept of the kitchen was based on the Pertinger looks.

Source : Pertinger.com

Technical data

  • Appliance dimensions (W x D x H): 1000 x 600 x 850-910 mm
  • Nominal heat output: 14.9 kW
  • Maximum heat output: 21.0 kW
  • Efficiency: 86.5%
  • Patented chimney connection system

2. Hafnertec Buffer Storage Tank

It is a relative complex system. But in essence is water boiler that uses a heat-exchanger to heat up the water and use it to store energy. As fresh water is always running through, there is no formation of Legionella. So, we can literally drink hot water from the tab. The buffer stores the energy coming from the Pertinger 100 Plus and from the solar panels.

The system was designed to plug in the future a heat pump. However, was recommended to live in the house for 2 years to understand if we need it or not.

Source: hafnertec.com


3. Solar Panels

The full system was delivered and installed by I-ON Energy Services.

The solar panels itself are from Sunpower. The model used was PERFORMANCE 380 BLK. We used about 32 modules for a 12.16KWp. From Fronius we used:

  • 10KVA Symo GEN24 10.0 Plus inverter
  • Smart Meter TS 65A -3
  • Ohmpilot consumption regulator

We do not have a battery yet.

For more information visit: Fronius

4. Clay Climate Panels

These are panels made of clay, in which the heating pipes were installed.

Storba Naturbaustoffe calculated the amount of heat needed based on the house plans.

They were installed and connected by ourselves.

How the heating systems works and how we use it?

  • When the Pertinger is in used, the heat produced by the stove feeds the buffer storage tank from Hafnertec.
  • When the solar panels produces electricity, the surplus is fed to the buffer storage tank from Hafnertec, only if needed. The solar panel systems is connected via the Fronius Ohmpilot. 

The system can be programed in a very detailed way. However, we kept it simple. We run the heating from 6:00 am to 10:00 p.m only if the temperature drops from 20°C. Due to the amount of insulation in the house, and the stamped clay wall, sometimes we need to turn it off. It gets really cosy.

When the water temperature in the buffer reaches 40°C, the pump activates and pumps water through the clay climate wall panels, and through the floors in the bathrooms. Each room can be independently controlled.

The days in which the electricity production in the solar panels is low and is cold weather, we use the wood stove to heat the house, cook, and warm up the water. In sunny days, we do nothing, and sometimes need to turn off the heating.

If you are asking yourself, is it hot in summer. Surprisingly not. The stamped clay wall and the clay walls in general regulates the heat inside, and the rear-ventilated facade hampers the heat to get in. I can say so far the temperature has been about 21°C - 23°C.

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