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How many degrees should a buffer tank be?

Which buffer temperature?

In old, uninsulated buildings with small radiators, values ​​of more than 60 degrees Celsius are often necessary in winter. On the other hand, energy-efficiently renovated and new houses are cozy and warm even on cold winter days with a lead time of 50 degrees Celsius.

How long does the temperature in the buffer tank last?

A buffer tank can store the excess heat from the sun for several days and release it as needed. Special solar storage tanks are often used for this purpose.

How quickly does a buffer tank cool down?

A storage tank cools down by around one to five degrees every day.

How many degrees does a hot water tank lose?

Without hot water circulation and water consumption, the storage tank loses approx. 1°C per hour (i.e. 24°C / day!).

Buffer storage — This is how you really save when heating!

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How much heat does a buffer storage tank lose?

At approx. 55°C (above) in 10 hours about 1 — 2 °C loss (without major withdrawals).

What temperature should the hot water be set to?

In a hot water tank that keeps hot water in reserve, the hot water temperature must never fall below 60 degrees Celsius, otherwise legionella can multiply. With these systems, the temperature on the heating must always be set to 60 degrees Celsius or higher.

How many liters of buffer per kW?

The rule of thumb is: 50 to 100 liters of water should be available for each generated water-carrying kW. For example, if a device has an output of 10 kW on the water side, a 500 — 600 L buffer tank should be installed.

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Is a larger buffer better?

In order to minimize heat loss, some experts recommend dimensioning the buffer storage as small as possible — in our example around 450 liters. However, this has the disadvantage that it can absorb correspondingly little heat. This limits the yield of solar energy, for example.

What is the difference between a buffer tank and a hot water tank?

The buffer tank is a hot water tank that is integrated into the heating system. The storage tanks are insulated and essential for efficient heating operation. Excess heat is stored in the buffer tank, so that the heating does not have to start up for every small heat demand.

How long do 2000 liters of buffer storage last?

4 days for hot water, winter about every 2 days, unless it’s around minus 20 degrees (which fortunately doesn’t happen that often), then I have to go to the basement every day. One charge is enough to fully charge both buffers even when the underfloor heating is running.

Which insulation for buffer storage?

A lateral insulation thickness of 10 cm is recommended for the tank wall and 15 cm insulation for the top of the tank. The thermal conductivity should be less than 0,035W/mK [2].

When is a buffer storage worthwhile?

Buffer storage tanks are mainly used in the field of renewable energies, for example in pellet heating systems or solar systems. But investing in a buffer tank can also be worthwhile when heating with fossil fuels, such as heating oil or gas.

What happens if the flow temperature is too high?

What happens if the flow temperature is too high? If the flow temperature is too high, it can become more difficult to control the heating because the heating water arrives hotter than the radiator needs. Due to the higher flow temperatures, the heat generator has to produce more heat.

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How high should the temperature in the boiler be?

Not all rooms have to be heated equally. The following values ​​are often used as a guide for feel-good temperatures: 20 to 22 degrees in the living room, 18 to 20 in the kitchen, 23 degrees in the bathroom, 16 to 18 in the bedroom. Lowering the temperature in a room by 1 degree can reduce heating costs down about 6 percent.

What is a normal boiler temperature?

If the building is well insulated and convectors and radiators are used, the temperature should not exceed 50 degrees Celsius. In the case of poorer thermal insulation, a setting of 60 to 65 degrees is required. If the house is equipped with modern surface heating, 30 to 40 degrees Celsius are sufficient.

How big buffer tank 4 people?

The size of the collector area for pure hot water preparation is calculated using the formula: people in the household x 1 m² of collector area. For a family of four, a collector area of ​​4 m² would make sense and therefore a buffer storage volume of 200-320 liters.

How much buffer for solar thermal?

Correct storage tank size for heating support

If the solar thermal system is also to be used for combined heating support, the buffer storage tank must be larger in addition to the collector area. As a guideline, experts assume a storage volume of 60 liters per square meter of collector area.

How much does a buffer store save?

According to calculations by the «Association of Energy Consumers», a buffer storage tank integrated into the heating system can pay for itself with energy savings of up to 30 percent.

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How much does an 1000 liter buffer tank cost?

Depending on the size and use, the cost of a 1000l buffer storage including installation is between 500 and 1.200 euros.

What is the heat exchanger in the buffer tank for?

A solar buffer tank is usually equipped with a heat exchanger. This directs the solar fluid through the container and enables the transfer of the solar heat to the heating water. The two liquids do not mix.

How big does a water heater for 2 people have to be?

It depends on how many people live in the household. If bathing is popular and frequent, the hot water tank in an average household should be between forty and fifty liters per person. If you only shower, 25 liters per person are sufficient.

At what temperatures do legionella form?

In the drinking water temperature range of 20-55 °C, legionella can multiply to concentrations that are harmful to health, with long residence times of the water of a few hours to days in installation pipes and water tanks favoring the multiplication of the bacteria.

At what temperature do Legionella die?

Legionella feel particularly comfortable at temperatures between 20 and 50 °C. At this temperature they multiply the most. Below 20 °C their number hardly increases and above 60 °C they are killed.

How quickly do legionella form in water?

The first symptoms of Legionnaires’ disease appear 2 to 10 days after contact with the pathogen. Between the infection and the outbreak of Pontiac fever there are 5 hours to almost 3 days, on average 1 to 2 days.

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