Support E-Katalog!
Get a Premium subscription for the price of a cup of coffee
Catalog   /   Climate, Heating, Water Heating   /   Heating & Boilers   /   Boilers

Comparison boilers

Save List
Add to comparison
Italtherm CITY CLASS 25 F 24 kW
Protherm Puma Condens 18/24 MKV-AS/1 20 kW
Vaillant ecoTEC pure VUW 246/7-2 18.5 kW
BAXI Duo-Tec Compact E 24 20.6 kW
BAXI Eco-4s 24 24 kW 230 V
Bosch Condens GC2300i W 24/30 C 24 kW 230 V
Italtherm CITY CLASS 25 F 24 kWProtherm Puma Condens 18/24 MKV-AS/1 20 kWVaillant ecoTEC pure VUW 246/7-2 18.5 kWBAXI Duo-Tec Compact E 24 20.6 kWBAXI Eco-4s 24 24 kW
230 V
Bosch Condens GC2300i W 24/30 C 24 kW
230 V
Compare prices 7Compare prices 31Compare prices 41Compare prices 13Compare prices 22Compare prices 78
User reviews
1
0
1
0
0
0
11
0
0
0
1
TOP sellers
Energy sourcegasgasgasgasgasgas
Installationwallwallwallwallwallwall
Typedual-circuit (heating and DHW)dual-circuit (heating and DHW)dual-circuit (heating and DHW)dual-circuit (heating and DHW)dual-circuit (heating and DHW)dual-circuit (heating and DHW)
Heating area192 m²160 m²148 m²165 m²192 m²192 m²
Condensing
Technical specs
Heat output24 kW20 kW18.5 kW20.6 kW24 kW24 kW
Min. heat output8.5 kW6.6 kW6.5 kW3.5 kW9.3 kW3 kW
Power supply230 В230 В230 В230 В230 В230 В
Power consumption103 W90 W100 W85 W80 W110 W
Coolant min. T35 °С30 °С30 °С25 °С30 °С30 °С
Coolant max. T80 °С75 °С80 °С80 °С85 °С82 °С
Heating circuit max. pressure3 bar3 bar3 bar3 bar3 bar3 bar
DHW circuit max. pressure6 bar10 bar10 bar8 bar8 bar10 bar
Consumer specs
DHW min. T35 °С35 °С35 °С35 °С35 °С35 °С
DHW max. T55 °С55 °С60 °С60 °С60 °С60 °С
Performance (ΔT=25°C)13.7 L/min13.8 L/min13.7 L/min14 L/min
Performance (ΔT ~30 °C)11.5 L/min9.9 L/min9.8 L/min
"Summer" mode
Heated floor mode
Warm start
Circulation pump
Control buseBusOpenTherm
Programmable thermostat
Boiler specs
Efficiency93.3 %107.8 %105.7 %108.8 %91.2 %103 %
Combustion chamberclosed (turbocharged)closed (turbocharged)closed (turbocharged)closed (turbocharged)open (atmospheric)open (atmospheric)
Flue diameter60/100 mm60/100, 80/125, 80/80 mm60/100 mm60/100, 80/80 mm120 mm60/100, 80/125, 80/80 mm
Inlet gas pressure20 mbar20 mbar20 mbar17 mbar
Max. gas consumption2.72 m³/h2.54 m³/h2.6 m³/h2.61 m³/h2.78 m³/h3.05 m³/h
Expansion vessel capacity8 L8 L7 L6 L6 L
Expansion vessel pressure1 bar0.8 bar0.5 bar0.75 bar
Coolant performance788 L/h
Heat exchangeraluminiumstainless steelsteelcopperaluminium
Connections
Mains water intake1/2"1/2"3/4"1/2"1/2"1/2"
DHW flow1/2"1/2"3/4"1/2"1/2"1/2"
Gas supply1/2"1/2"1/2"1/2"3/4"3/4"
Central heating flow3/4"3/4"3/4"3/4"3/4"3/4"
Central heating return3/4"3/4"3/4"3/4"3/4"3/4"
Safety
Safety systems
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
frost protection
water overheating
flame loss
draft control
water circulation failure
frost protection
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
frost protection
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
frost protection
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
frost protection
gas pressure drop
water overheating
flame loss
draft control
water circulation failure
frost protection
More specs
Dimensions (HxWxD)727x400x300 mm626x400x270 mm720x440x372 mm700x400x299 mm730x400x299 mm710x400x300 mm
Weight30 kg25.6 kg33.5 kg34 kg29 kg36 kg
Added to E-Catalogaugust 2017september 2020june 2017march 2021august 2016june 2021
Price graph

Articles, reviews, useful tips

All materials
Category brands reviews boilers
Brand rating from the boilers section compiled based on reviews and ratings from site visitors.
07.2025
Rating boilers (july)
The popularity rating of boilers is based on comprehensive statistics regarding the interest shown by the online audience.
Common Error Codes in Gas Heating Boilers
The error codification system allows you to identify the essence of the problem and determine ways to quickly solve it.
The best electric boilers
Good electric boilers for heating and heating, which can work even in the absence of a central power supply
Saving Electricity with a Smart Home: Which Devices Help Cut Costs?
A smart home is not only automation, but also real energy savings.
The best double-circuit condensing gas boilers
Autonomous and energy-efficient heating boilers with high efficiency and a separate hot water supply circuit
The best double-circuit condensing boilers
Autonomous and energy-efficient heating boilers with high efficiency and a separate circuit for hot water
The best gas boilers with a boiler
Equipment for independent heating and domestic hot water with a tank for hot water