Frequently asked questions ánd answers about the Durocan:

When switching from gas to a heat pump, should we replace the radiators?

Generally not. However, most existing homes are not immediately suitable for a heat pump system. They often need an insulation upgrade, such as insulating walls, floor and roof, HR++ glass, and draft holes and thermal bridges. The current radiators are dimensioned for the old, less well insulated, situation. This means that they are over-dimensioned in the new situation. By lowering the temperature somewhat with respect to gas heating and keeping it steady at a constant temperature, it becomes possible to retain existing radiators.

Why does the heat pump use CO<sub>2</sub> as a refrigerant?

The established heat pump manufacturers use synthetic refrigerants such as R134A, R407C, R407F and R410A. These, however, are environmentally harmful and are gradually being phased out. By 2020, the total production of synthetic refrigerant is to be reduced by approximately 40%. In 2030, only 20% of the currently produced synthetic refrigerants will still be allowed on the market. Durocan uses the natural refrigerant CO2. The system must therefore operate under a higher pressure than the aforementioned traditional systems. The advantage is that it can, at the same time, achieve much higher temperatures in one step. Existing high temperature heat pumps often use 2 circuits to reach the higher temperature, resulting in lower efficiency. CO2 technology easily reaches 78 degrees with a particularly high efficiency.

Do we need 3-phase electricity?

No, a maximum input power of 2.5 kW applies per heat pump. Many traditional heat pump installations require investments to increrase the power capacity. In most cases that is not necessary with Durocan. Nice!

Do we need a smart meter?

You need a smart meter to be able to use the increased self-consumption of solar power. After all, Durocan needs the data from the feed-in to be able to switch the system smartly. However, the Durocan works well, even without a smart meter. So, it is not mandatory, but it does increase efficiency.

Where do we place the heat pump?

The system consists of an outdoor and an indoor unit. The outdoor unit is about the size of an air conditioning unit. You can place it on a flat roof, on brackets on a wall, or in a chimney-like construction. The indoor unit is located in the technical area of the house. The indoor unit is a bit larger than your current gas heating system – keep that in mind when determining where the installation will be located.

Can we link existing PV (solar panels) to the system?

Yes, always and with every system. We have solved this very cleverly by monitoring net feed-in on the smart meter. The system is designed to use as much of the remainder of the generated electricity as possible, to produce hot water.

Can we connect existing solar water heater/thermal panels to the system?

Preferably not. The hardware and prediction algorithms Durocan uses do not take into account other linked systems. However, the solar thermal panels often already heat an existing thermal tank. You can place the Durocan system next to the existing solar water heater system.

Will we use a lot of electicity?

The electricity consumption will, of course, increase considerably because the system uses power instead of gas. But on the other hand, you no longer have a gas bill (or at least a very low one). Depending on gas and electricity prices the total energy costs of the household will decrease compared to the current situation.

How much noise does the heat pump generate?

The Sanden SanCO2 is a particularly quiet machine. The noise level is ‘whisper quiet’, 37 dB(A)Nevertheless, we advise you not to place the outdoor unit next to your bedroom window (or the one of your neighbors). Always keep in mind noise levels when choosing a suitable location for your heat pump.

Which part of my energy bill is for heating?

Depending on the country, about 60-70% of your energy bill is for heating. The share of electricity is therefore not that high. But if you switch to a heat pump, all energy consumption becomes electric. That has an advantage because electricity can be generated with solar panels (PV). That way you can save a lot on your future energy bill!

You may be using the grid as your battery – feeding PV power in during the day and using grid power at night. Our recommendation is not to install your entire future consumption in PV panels but about half. You just buy the other half from your energy supplier. Why? Because with half of the panels the majority of the power generated coincides with consumption – you can use that power as it is being generated. 

Can I view the status and settings of the system?

Sure. On the 7“ touch screen you can view the current status, consumption and history. In future software rollouts you will be able to consult your data via our cloud platform and compare it with the ‘best of the class’.

What will a Durocan system cost?

The cost of a Durocan installation depends on the particulars of the installation – one or more heat pumps, and 200 or 300 liters of heat storage. On average, the price including installation is around € 15,000 (including VAT and excluding subsidy).

Does all our sanitary water for shower and bath come from the heat pump?

All the hot water that you need is supplied by the heat pump. Enough for your family and guests. There is an electric resistance backup in the system for optimal comfort.

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