Heaters allow for continuous supply of hot water, without limitations related to the tank capacity, and therefore without heat losses caused by storing water in the tank. Electricity is only consumed during active water heating. Additionally, hot water is available almost immediately after turning on the tap. But what should you pay attention to when choosing a heater? What is the difference between a hydraulic heater and an electric one? Which heaters should be used in small spaces? Read and find out for yourself!
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How to choose a heater?
When choosing a water heater , it is worth considering the number and location of water collection points. For standard bathrooms with a shower, a device with a power of 12-15 kW will be perfect. In turn, for bathtubs, a heater with a minimum power of 18 kW should be used. A device with higher power - from 24 to 27 kW - is worth installing if you have a rain shower, where the heater must be more efficient. In the kitchen, the most optimal solution will be one with a power of 6 kW, allowing you to obtain a sufficient stream of water, for example, to wash dishes.
What is the difference between a hydraulic heater and an electric heater?
When choosing a heater, it's worth it 
also become familiar with its types and the differences between them. The first aspect we should take into account is the control method. Heaters available on the market offer hydraulic or electronic control.
The hydraulic control switches on power level 1 or 2 mechanically, depending on the amount of water flowing. The hydraulic heater has a switch that allows you to set full power or limit it (economy mode), which means that the more water we use at one time, the more its temperature will decrease. An example of such a device is the KOSPEL PPH3 hydraulic multi-point hydraulic heater .
The electric heater ensures smooth regulation of water temperature in the range of 30-60 o C, and the use of a sensor to measure water flow turns the device on at a flow of 2.5 l/min. This is especially important in installations with low water pressure.
Additionally, electronic models such as the PPE3 electronic LCD electronic heater from KOSPEL have the ability to additionally heat already hot water, for example using a domestic hot water (DHW) tank. The electronic 3-phase heater can also supply hot water to several consumption points, and a wide power range from 9 to 27 KW/400V allows the heater to be perfectly matched to the user's individual needs. Additionally, KOSPEL electric heater models are devices with energy class A, which come in various sizes and with different power.
Which heater will be adapted to different requirements?
The three-phase PPE3 electronic LCD electronic heater model with dimensions 245 x 126 x 440 mm is characterized by a wide power range from 9 to 27 kW/400V. The water pressure in the heater is 0.1 - 1.0 MPa, while its efficiency varies depending on the selected power. For 9/12/15 kW/400V it is 4.3/5.2/5.8/7.2 l/min, for 18/21/24 it is 8.1/8.7/10.1/ 11.6 l/min., while for PPE3 electronic LCD with a power of 27 kW/400V it is 13.0 l/min.
Its hydraulic equivalent is the PPH3 hydraulic hydraulic heater with power ranging from 9 to 21kW/400V. The dimensions of the model are the same as in the electronic version, while the water pressure is 0.15 - 1.0 MPa. Thanks to the power switch, the hydraulic heater can operate at full power or in economy mode. The device is also equipped with two-stage automatic power modulation, which, depending on the water flow, will switch on the first or second power stage.
Where are washbasin heaters useful?
Heaters with lower power are perfect for single points such as a sink or washbasin. An example of such a solution is the Kospel EPO2 electric heater, which can be installed with the spigots up or down - above or below the washbasin. The Kospel electric heater with power from 3.5 kW to 6 kW/230 has dimensions of 168 x 76 x 200 mm and the water pressure is 0.12 - 0.6 MPa.
The second solution is the Kospel heater with a power of 3.5-6 kW/230-400V and the same pressure, an EPO washbasin heater with heaters made of copper - in this model the dimensions are 229 x 87 x 209 mm.
Which heaters should be used in small spaces?
It is also worth mentioning heaters 
dedicated to small spaces, such as a summer house, a garden shed or an office. The Kospel EPS2 washbasin heater is a small device with a power of 3.5-5.5 kW/230V and dimensions of 135 x 69 x 195 mm. In this model, the water pressure is 0.1 - 1.0 MPa.
In the case of an allotment shower, the EPS2.P instantaneous heater with a fine-jet shower spout will be perfect. The small dimensions of the heater make it easy to install in virtually any place with access to water and electricity.
Flow heaters from KOSPEL are a solution that allows you to save energy and water by up to 50%, thus being an environmentally friendly way to obtain hot water. They consume electricity only when water flows, and at the same time, the consumption of heated water is not limited by the tank capacity.