Knowledge Center

Knowledge centre for Attack condensing boilers with instantaneous DHW heating – the differences between the CONDENSING Premium, KST/KZT Plus and the newer CONDENSING KST/KZT ranges.

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Three Attack ranges with flow-through DHW heating

Attack, a Slovak manufacturer of heating technology, offers condensing boilers with flow-through domestic hot water (DHW) heating in three product ranges:

CONDENSING Premium (10/15/20) – a range with outputs of 10, 15 and 20 kW, with a manufacturer-stated high efficiency of 98.5 – 109.5%.
KST Plus / KZT Plus (26 kW) – boilers with a hermetic (sealed) combustion chamber and a modern design, 26 kW output.
CONDENSING KST 24 / KZT 25 – a newer range with an output of 2.8 – 24 kW (KST), or 25 kW (KZT), with an emphasis on compactness and smart operation control.

The KST and KZT designations distinguish the specific boiler design within a given range – we're happy to help you choose the right model based on your needs.

Which model to choose

For a smaller apartment with lower heat demand, the CONDENSING Premium 10 or 15 is sufficient. For a typical house with one bathroom, the CONDENSING Premium 20 or the newer CONDENSING KST 24 is suitable. If you need higher output, go for the KST/KZT Plus 26 kW range.

You can find more about the principle of flow-through heating, installation and troubleshooting common problems in our Knowledge Center for boilers with flow-through DHW heating. You'll find the full range of the Attack brand in the Attack category.