Rating of instantaneous gas water heaters without a chimney: best offers and selection tips

The modification of the Therm 4000 S series from the Bosch brand is distinguished by its standard dimensions, thanks to which the column can be placed even in a small room.

Despite its relatively modest performance, a water heater designed for one water intake point is quite powerful. Therefore, with it, the water almost instantly heats up to 60 degrees. It is also convenient that the Bosch Bosch WTD 12 AME model operates without interruption even with low inlet water pressure: the unit only needs 0.1 atm to start the heating process.

Gas consumption is also pleasing: this column consumes 2.1 cubic meters. m/h when connected to a common gas pipeline and 1.7 cubic meters. m/h when operating from a cylinder. Fuel saving is also facilitated by electric ignition, which turns on the burner only when the tap is opened.

Specifications:

• power – 20.8 kW;
• productivity – 8 l/min;
• minimum/maximum water pressure – 0.1/12 atm;
• control type – electronic;
• dimensions (WxHxD, mm) – 300x568x170.

Bosch WTD 12 AME can be called the optimal model for homes with low pressure in the water supply. And working on liquefied gas from a cylinder allows you to use the equipment even where gasification has not yet been carried out.

The budget speaker from Oasis has low performance, but fully compensates for it with its dimensions and low weight of 4.2 kg. It is one of the most compact in height and depth, making it suitable for small rooms or even niches. Electric ignition is carried out using batteries, which makes the device operate completely independent of the mains.

A bonus is the operation under conditions of low pressure in the gas pipeline. To start heating the model normally, a pressure of 0.02 MPa is sufficient. At the same time, the column maintains high efficiency - more than 90%. The manufacturer provides the ability to limit the maximum water heating temperature, which allows you to save gas.

Specifications:

• power – 11 kW;
• productivity – 5 l/min;
• minimum/maximum water pressure – 0.2/8 atm;
• control type – mechanical;
• Dimensions (WxHxD, mm) – 290x370x120.

Oasis B-12W is installed vertically with bottom connection. The multi-level security system makes operation as reliable as possible, which is especially important for families with children.

Among gas water heaters operating without a chimney, the Chinese-made model stands out for its more compact depth, which ensures fairly flexible installation.Roda JSD20-T1 is equipped with a gas control system and makes it possible to limit the water heating temperature.

A useful feature of the model is a reliable frost protection system. As soon as the heat exchanger temperature drops below +5 degrees, the built-in ceramic heating elements automatically begin heating the water in the tubes.

The model is maximally adapted to work in conditions of low gas pressure and is extremely sensitive to the opening of a water tap. In addition to the integral gas control, the water heater is equipped with protection against overheating and exceeding the permissible water pressure.

Specifications:

• power – 20 kW;
• productivity – 10 l/min;
• minimum/maximum water pressure – 0.3/8 atm;
• control type – mechanical;
• dimensions (WxHxD, mm) – 330x515x140.

The modification is extremely protected from pressure or temperature surges, has internal control systems, and is therefore optimal for installation in problem housing with old communal communications.

Another model from Bosch in the review, capable of providing hot water to homes not connected to the gas supply network. It features impeccable build quality and reliable operation. In addition to limiting the maximum heating of the carrier, the column has a flame modulation system. The option allows you to regulate the strength of the fire, strictly maintaining the set water temperature.

The heat exchanger itself is made of high-quality copper without unwanted impurities, resistant to burnout. The model is assembled conscientiously and is practically not subject to breakdowns.

Specifications:

• power – 25.4 kW;
• productivity – 10 l/min;
• minimum/maximum water pressure – 0.3/12 atm;
• control type – electronic;
• dimensions (WxHxD, mm) – 300x568x170.

Bosch WTD 15 AME belongs to the Therm 4000 S series. It is characterized by economical consumption of blue fuel and has an impressive design. We can recommend this model to consumers who are willing to overpay for reliability, uninterrupted operation and a decent level of equipment safety.

The SF0420T bal turbocharged water heater is just the type of gas water heater operating without an exhaust hood, which is ideal for working with unstable water pressure. After all, the Superflame brand itself was registered in Spain; most of the brand’s products are aimed at Europe. But after entering the Russian market, the manufacturer improved the speakers to suit the realities of operating conditions in the CIS countries.

A pleasant bonus for buyers of brand water heaters is the opportunity to support a domestic manufacturer, because the equipment is assembled at the Tula Gas Equipment Plant and complies with ISO 9001-2011 standards.

The protection system is made at the highest level: the functionality will not allow the column to turn on without water, which protects the heat exchanger from burning out. There is also an overheating blocking unit. Particularly noteworthy is the filigree adjustment of gas and water flow, carried out by two rotary knobs.

Specifications:

• power – 20 kW;
• productivity – 10 l/min;
• minimum/maximum water pressure – 0.25/7.5 atm;
• control type – mechanical;
• dimensions (WxHxD, mm) – 320x520x150.

The model is optimal for use in buildings with low pressure in water pipes. It is recommended for purchase by anyone who wants to independently adjust the potential fuel and water consumption in accordance with their needs.

An inexpensive model with an extremely wide range of useful additions. Gorenje GWH 10 NNBW is equipped with a thermometer, power-on and heating indicators, which greatly facilitate monitoring the operation of the equipment.

The number of integrated security systems is also impressive. The model is not subject to freezing, has water and gas filters, and is blocked from overheating. Additionally, it allows you to adjust the water heating threshold, which makes it possible to reduce gas consumption.

Specifications:

• power – 20 kW;
• productivity – 10 l/min;
• minimum/maximum water pressure – 0.2/10 atm;
• control type – mechanical;
• Dimensions (WxHxD, mm) – 327x590x180.

The model is undemanding in terms of water pressure in the system. The technical parameters and quality of the assembly significantly exceed the price segment of the product.

Bosch WTD 18 AME is a canonical model that embodies all the advantages of the Therm 4000 S series. It has the highest power rating in the rating. Economical gas consumption is possible thanks to the presence of an atmospheric burner, which delicately mixes fuel with air.

The accuracy of water heating is adjustable down to 1 degree, so the heater is optimally adjusted to the needs of the family. The self-diagnosis system and protective complex eliminate the likelihood of malfunctions or emergency situations.

A high-quality copper heat exchanger lasts for years, so the Bosch WTD 18 AME is practically not prone to breakdowns, and any inaccuracy in operation is instantly displayed on the display. The device is capable of modulating the flame depending on current conditions, so the set outlet temperature is maintained simply impeccably.

Specifications:

• power – 31.6 kW;
• productivity – 12 l/min;
• minimum/maximum water pressure – 0.3/12 atm;
• control type – electronic;
• Dimensions (WxHxD, mm) – 364x568x175.

Bosch WTD 18 AME is an ideal option for those who need high heating temperatures with relatively economical consumption of resources. This speaker is extremely reliable and productive, so it fully justifies its cost.

Like competing models from Bosch, the Compact C 350 F from DEMRAD can operate on liquefied and main gas if properly configured. The exhaust of combustion products is turbocharged, there is no pilot flame, which greatly facilitates operation. An additional advantage of the modification is the ability to serve up to three water intake points.

The device's security system is carefully thought out. The model has fuses for flame extinction, heater overheating, and pressure increase in the water circuit. Additionally, a water flow sensor and a pilot burner controller are built into the unit.

Specifications:

• power – 27.9 kW;
• productivity – 14 l/min;
• minimum/maximum water pressure – 0.5/10 atm;
• control type – mechanical;
• Dimensions (WxHxD, mm) – 383x685x283.

One of the most secure speakers in the rating is worth buying for those who value operational safety. The high performance of the model will be a pleasant bonus and will complement the pleasant experience of using the model.

With relatively modest power and performance, Termaxi JSG-20R heats water up to a maximum of 65 degrees, thanks to which the user can adjust the temperature as comfortable as possible. At the same time, the nominal gas consumption is only 2 cubic meters. m/h. The equipment itself complies with ISO 9001 standards, which serves as additional confirmation of the high quality of the model.

Electric ignition is carried out from the network, which makes the water heater vulnerable to voltage surges, but allows you to save money by not buying batteries or accumulators. For smooth operation, many users recommend additionally installing Voltage regulator.

The gas block has a “Winter/Summer” switch, thanks to which in the warm season the user can reduce fuel consumption by approximately 25%.

Specifications:

• power – 20 kW;
• productivity – 10 l/min;
• minimum/maximum water pressure – 0.2/6 atm;
• control type – electronic;
• dimensions (WxHxD, mm) – 350x560x142.

The model is extremely economical and fully meets the needs of a family of 3-4 people. Operating at low pressure in the water supply system makes it possible to install Termaxi JSG-20R even on upper floors, where there is often a lack of water pressure.