TOP-5 single-phase electric boilers for small apartments

Wall-mounted electric boiler Thermex EUROSTAR E906 is great for heating small-sized apartments in which there is no gas supply. The device has a single-circuit design and is designed for heating rooms with an approximate area of 48 m2 with the possibility of connecting an indirect heating boiler for the organization of hot water supply. The model with a useful power of 6 kW has an IP40 electrical protection class (without protection from water penetration) and is designed for installation in a room with a humidity of less than 85%, which allows the boiler to be installed away from the areas where the washbasin and shower are located. A single-phase (230 V) or 3-phase (400 V) connection is used to power the device. The device is characterized by an effective efficiency index of 99.5% and is capable of providing the temperature of the coolant in the heating circuit in the range of 30 – 80 °C at a maximum allowable pressure of 3 bar.

The heater is equipped with a convenient control panel with a small digital display and touch buttons for settings. The device is equipped with an electric heater unit consisting of 3 heating elements with a capacity of 2 kW each, a heat exchange tank, a circulation pump and a 6-liter expansion tank. The built-in safety system turns off the device in case of overheating and violation of the circulation of the coolant, and the frost protection turns on heating when the temperature in the heating circuit drops below 5 °C. The manufacturer also allows the addition of antifreeze and additives certified for use in electric boilers to the coolant. As a plus of the model, we note its equipment with a timer of the heating system, which allows you to install heating software settings for a whole week with fine-tuning tasks during each day.

The electric boiler Kospel EKCO.R2 6 of the Polish manufacturer of household heating equipment is the optimal solution for providing heat to small-sized rooms. The single-circuit model with a capacity of 6 kW is designed for heating an area of about 48 m2. When connecting an external indirect heating boiler, the device will also prepare hot water. But a prerequisite for the joint operation of the boiler with a storage water heater is to retrofit it with a 3-way valve and a temperature sensor. Of the 2 options for electrical connection (220 and 400 V), the most convenient way for an apartment and a private house will be to use a household single-phase power grid. The device has compact dimensions of 660x380x175 mm, which are smaller in each linear dimension than most similar models, as well as a light weight of only 18 kg.

The heating unit is equipped with a stainless steel flask with 3 built-in heating elements, a remote control unit, a safety group, a mechanical pressure gauge, an automatic air vent, a flow sensor and a 3-speed Grundfos circulation pump, which, depending on the settings, can operate in constant and automatic modes. But the main feature of the model is the built-in room temperature controller, which allows you to automatically modulate the heating power depending on how warm the room is.

The control panel contains buttons for power switches and economy mode, as well as 2 temperature change buttons. There are also power, heating and ECO-mode indicators, and the place of the usual display is occupied by an LED scale of the set temperature, on which each division corresponds to 5 °C. Activation of the ECO mode allows you to limit the heating power to 2/3 of the nominal value, which will be useful with reduced heat demand, as well as in small rooms. The temperature of the coolant in the heating circuit can be adjusted from 35 °C to 85 °C. And the IP22 protection class somehow helps to protect yourself from moisture in damp rooms.

The wall-mounted electric heating boiler Protherm Skat 6KE/14 is designed for universal connection type (220 or 400 V) and heating of small premises. The modern single-circuit model, which has undergone a number of changes in the design and internal layout of the elements, is now made in a single style with gas heating boilers. The device is equipped with a block of electric heaters with a smooth modulation of 6 kW power, a 2-stage circulation pump with built-in blocking protection, an 8 L expansion tank, an automatic air removal valve, as well as an integrated eBus communication bus that expands the control capabilities of the device. When connecting an external capacitive water heater with a 3-way valve (optional), the boiler will be able to prepare hot water, both in winter and in summer. The run-out function of the pump, which continues to work for some time after the heating elements are turned off, and the heat-protective fuse prevent overheating of the boiler. The frost protection function is implemented by automatically turning on the pump at a coolant temperature of 8 °C and turning it off when its temperature reaches 10 °C, and the built-in water pressure sensor will not allow a violation of the circulation of the coolant in the heating system.

The device is equipped with an advanced electronic control system with self-diagnosis and a set of sensors that monitor the performance of each node. To reduce energy consumption, a special ECO operation mode is provided, which reduces the temperature of the coolant and hot water to a lower value. With additional installation of an outdoor temperature sensor or connection of a room thermostat, the heating device will work automatically, adjusting the heating temperature to environmental conditions. In addition, the unit can be retrofitted with a programmer that will control the heating system according to the specified parameters. The great advantage of the model is the ability to integrate with gas and solid fuel boilers, heat pumps and solar collectors. The device can be included in the cascade heating system, which allows to significantly increase the heating capacity, as well as use in a two-tariff grid for calculating energy consumption, saving on electricity during night hours. If the operating rules prescribed by the manufacturer are observed, the boiler will last at least 10 years.

The Bosch Tronic Heat 3500 6 single-circuit heating boiler is made in a fashionable modern DNA style with a steampunk design, and is designed for efficient heating of small apartments and private cottages. Thanks to its compact dimensions of 712x330x273 mm and a light weight of 17 kg, the device can be easily mounted on a wall or in a niche opening. Unlike the simpler Bosch Tronic Heat 3000 heat generator, this model comes with an already built-in 3-speed circulation pump and an expansion tank with a capacity of 7 liters, which allows you to use it as an independent heat source right out of the box. For the organization of hot water supply, it will only be necessary to additionally purchase a 3-way valve with an electric servo drive and a capacitive indirect heating tank. And everything else will be done by the built-in automation of the device, which is able to control the preparation of hot water.

The heating device uses a heating unit of 3 heating elements of 2 kW each, which, as they reach full power, are switched on sequentially, and when operating at partial power, they are switched on alternately, which prolongs their service life. An intuitive, user-friendly control panel with a round graphic display and buttons makes setting up and controlling the operation of the boiler a simple task. The current state of the boiler parameters and fault codes are displayed in real time on the display. The electronic control unit on microprocessors regulates the thermal parameters of the water at the entrance to the heating circuit, and the safety temperature limiter STB prevents overheating of the device during operation. The pressure switch monitors the minimum water pressure at the inlet pipe, which should not fall below 0.6 bar, and the frost protection system (5 °C) will not allow defrosting of the boiler.

External devices and additional accessories compatible with the device are available as options determining adaptive regulation of the boiler's thermal performance: wired and wireless room temperature controllers of the ST and Honeywell type, a thermal relay for underfloor heating systems, an outdoor temperature sensor and a cascade connection module. Reliable and thoughtful layout, as well as the use of high-quality components in the design, allowed the manufacturer to declare a 10-year minimum service life of the device. The boiler can be connected to a 230 V household power supply network laid with a large-section cable, or to a 400 V power grid.

The single-circuit electric heating boiler Vaillant eloBLOCK VE 6 is a high-quality advanced device for heating small-sized apartments and small suburban households. This is the youngest model of the series with a capacity of 6 kW, which allows heating rooms with an area of up to 45 m2. Connecting an external storage tank via a 3-way valve will expand the functionality of the device, which will be able to use the heating circuit coolant to heat water in the boiler. The device provides connection to a 2-tariff electricity metre, which allows you to significantly save money on a low night tariff.

This model has the ability to connect to a single-phase (230 V) or three-phase (400 V) AC power source. As part of the equipment of the device there is a 3-stage circulation pump with a lock protection function, a mechanical pressure gauge, an air vent, an 8 L expansion tank, as well as a heating unit with 2 heating elements of 3 kW each that support step-by-step power modulation. The device can be used to control low-temperature heating circuits "underfloor heating", connected to cascade heating systems, gas boilers, solar systems and heat pumps. The safety of operation of the device is provided by the built-in protection against blocking of the pump.

The temperature in the heating system is regulated in the range from 25 °C to 85 °C, and in the storage boiler from 30 °C to 70 °C. The temperature setting can be performed using the rotary knob of the control panel, and the current operating mode is selected using two keys. The LED display shows the temperature in the supply line of the heating circuit, the pressure in the system, the selected operating mode, fault codes and additional information. As additional options, automatic operation of the boiler under the control of a room thermostat or weather-dependent automation is possible. With proper installation and compliance with all operating requirements, the expected service life of the device is 10 years.