Balance sheet: how much can be saved on DHW by changing from a boiler to heat…

The reader has a problem with the fact that no one wants to tell him specifically how much he can save by changing from a coal boiler to a heat pump, which is of course a legitimate question. If he knows how much he will save, he can calculate the return. And so we simplified his question a little and sent it to experts to at least complete the calculations for him.

I would like to change the heating from a classic boiler to coal with the help of New Green Savings subsidies. But I have doubts if I won’t make a profit on it. I have an uninsulated house of 150 m² with plastic windows. I heat with cast iron radiators and make water with an electric 200l boiler. When I ask anyone, they are not able to give me at least a simple calculation of what the costs will be with a heat pump. Maybe at least for the production of that water, so that I have a simple comparison.

Heating hot water with the help of a heat pump is definitely worth it, but not every boiler is adapted to it. It is therefore necessary to take into account that the boiler must be equipped with an exchanger for connection to the heat pump. During renovations, this means in most cases the replacement of the existing boiler. On the other hand, heating and hot water heating are among the largest consumers of energy in the household, and the use of one common energy-saving source can bring a substantial reduction in the costs of its operation. In this case, I recommend choosing a boiler with a larger volume and a temperature of, for example, 45–50 °C. There is no danger that, for example, the child will get burned and at the same time save on energy.

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So the initial costs just for the production of domestic hot water are not small. But let’s get to the specific numbers. A heat pump can save the annual costs of heating water quite significantly compared to a classic boiler. Savings can be demonstrated, for example, on your two hundred liter boiler, which will need approximately 11 kW to go from 10°C to 55°C. With a heat pump, about 2–3 kW is enough for the same heating. If we were to calculate the price of one kilowatt for 3.50 CZK, then the difference between heating with a boiler and a heat pump is approximately 31.50 CZK per day. It already amounts to more than ten thousand crowns per year.

Jakub Tykal, sales and marketing director of Acond, answered.

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