ATTACK TUVS 600 Storage Tank with Stainless Steel DHW Coil and One Heat Exchanger (insulation included)

Product detailed description

ATTACK TUVS 600 Buffer Tank with Stainless Steel DHW Coil and One Heat Exchanger (insulation included)

ATTACK buffer tanks with heat exchanger form a complete range of five solutions, which differ from each other in the method of domestic hot water (DHW) preparation and the number of built-in heat exchangers for charging heating water. This choice is exactly what determines how simply and at what cost you can connect the tank to a heat pump, a wood gasification boiler, a gas boiler, or solar collectors:

• AS – a tank with one heat exchanger, purely for heating accumulation. It has no built-in DHW preparation whatsoever, and serves solely for accumulating heating water and hydraulically separating the heat source (e.g. a heat pump or gasification boiler) from the heating circuit. DHW preparation is in this case handled by an external cylinder (e.g. the ATTACK Z range).
• HR – a tank with a built-in enamelled DHW cylinder with a volume of 160 l inside the buffer tank body (a "tank-in-tank" principle). It contains no additional heat exchanger – heating water is fed directly into the buffer tank, which is why it is best suited for heat sources that do not require hydraulic separation (typically solid fuel boilers with their own circulation pump).
• HRS – the same construction as HR (built-in enamelled 160 l DHW cylinder), supplemented with one additional external heat exchanger for charging heating water. Thanks to this heat exchanger, the HRS is also suitable for heat sources requiring hydraulic separation, such as a heat pump.
• TUV – a tank with a stainless steel coil inside, which ensures instantaneous heating of domestic hot water – cold water flows through the coil and is heated immediately, without the need for a separate DHW cylinder. Heating water is fed in directly, without an additional heat exchanger.
• TUVS – a combination of TUV (stainless steel coil for instantaneous DHW heating) and one external heat exchanger for charging heating water – the most versatile solution of the range, suitable also for heat sources requiring hydraulic separation (heat pump, a combination of multiple sources).

ATTACK TUVS 600 Buffer Tank with Stainless Steel DHW Coil and One Heat Exchanger (insulation included) belongs to the ATTACK range of buffer tanks with heat exchanger in the 600-litre volume category. It is the TUVS – buffer tank with stainless steel DHW coil and heat exchanger variant – a stainless steel coil for instantaneous heating of domestic hot water, complemented by one additional external heat exchanger for charging heating water. This page describes exactly this specific model, including its technical parameters, recommended heat sources, and the most frequently asked customer questions.

Key features

• Removable soft insulation 100 mm thick in a durable leatherette (PVC) cover – easily removed and refitted during connection servicing, without permanently damaging the tank surface.
• Internal stainless steel coil for instantaneous (hygienic) heating of domestic hot water with an estimated heat exchange surface of approx. 2.2 m² – no stagnant water, minimal risk of bacterial growth including legionella.
• External heat exchanger for charging heating water with an estimated heat exchange surface of approx. 2.2 m², enabling hydraulic separation of the heat source (e.g. a heat pump) from the heating circuit.
• Welded steel body with anti-corrosion internal treatment, rated for a max. operating pressure of 3 bar and water temperature up to 95 °C.
• Prepared port with a G 6/4" thread for installing an ATTACK TH electric heating element (2–6 kW) as a backup or supplementary heat source.
• Multiple ports (approx. 8 in total) for connecting heat source(s), heating circuits, temperature sensors, and venting – exact port layout according to manufacturing documentation.
• Compact footprint with a height-to-diameter ratio optimised for passing through standard doors and staircases when installing in a boiler room or utility room.
• Ability to combine several heat sources simultaneously (heat pump, wood gasification boiler, solar system, electric heating element) thanks to multiple connection levels on the tank shell.
• Made in Slovakia, 24-month warranty from commissioning (max. 30 months from dispatch from the factory).

Technical parameters

Installation recommendations

Thanks to the removable soft insulation, 100 mm thick with a practical leatherette cover, the tank retains water temperature over the long term even outside the heating season, and access to the insulation for connection servicing is simple – the insulation can be removed and refitted at any time without damage. The combination of a stainless steel coil for instantaneous DHW heating and an external heat exchanger for charging heating water makes the TUVS the most versatile solution in the entire range – suitable for heat pumps as well as for combining multiple heat sources (e.g. a heat pump together with a gasification boiler or a solar system), while retaining the hygienically advantageous instantaneous heating with no risk of legionella.

The TUVS600K tank is suitable for use with ATTACK heat sources – with ATTACK DPX/SLX wood gasification boilers (which require heating water accumulation due to the combustion process), with heat pumps, as well as with ATTACK EKO/PLQ/KLQ/E/EZ COMBI stationary cast-iron gas boilers, which require an external indirect DHW cylinder for hot water preparation (these boilers do not have a built-in cylinder). We recommend always having the exact sizing of pipework, pumps, and safety fittings assessed by a qualified heating technician according to the project documentation of the specific building.

When installing, allow sufficient space around the tank for service access to the ports, sensors, and any electric heating element. We recommend installing a safety valve, an expansion vessel, and a venting valve at the highest point of the system in accordance with applicable standards for closed heating systems.

How to correctly size the buffer tank volume

The volume of the buffer tank should be based primarily on the heat source output, the heat loss of the heated building, and the operating mode. For wood gasification boilers (e.g. ATTACK DPX/SLX), a rough guideline of 20–40 litres of accumulation per 1 kW of boiler output is usually recommended, so that the boiler can burn down at full output even when there is no immediate heat demand in the house. For heat pumps, the volume is more a matter of hydraulic balancing of the circuit and the number of heating zones, and usually a smaller volume than for wood boilers is sufficient. The TUVS600K model with a volume of 600 litres is suitable roughly for a heat source with output within the corresponding range – however, we always recommend having the exact calculation done by a heating technician based on the energy label or heat calculation of the specific building, not just based on a table estimate.

Other volumes in the same TUVS variant

If a volume of 600 litres is not exactly what you are looking for, we also offer the same design solution (a stainless steel coil for instantaneous heating of domestic hot water, complemented by one additional external heat exchanger for charging heating water) in our e-shop in other volume ranges:

• ATTACK TUVS 500 Buffer Tank with Stainless Steel DHW Coil and One Heat Exchanger (insulation included) – 500 l
• ATTACK TUVS 800 Buffer Tank with Stainless Steel DHW Coil and One Heat Exchanger (insulation included) – 800 l
• ATTACK TUVS 1000 Buffer Tank with Stainless Steel DHW Coil and One Heat Exchanger (insulation included) – 1000 l

A larger volume means a longer accumulation time and fewer charging/discharging cycles per day, which saves the heat source, but also requires more space in the boiler room and a higher purchase price. A smaller volume, on the other hand, is cheaper and more compact, but if undersized, the heat source may cycle on and off more frequently.

Maintenance and operation

The TUVS600K buffer tank requires minimal maintenance – we recommend checking the tightness of all ports and connections, the function of the safety valve, and the condition of the insulation once a year. For tanks with a stainless steel coil (TUV/TUVS), it is advisable to occasionally check the flow rate and, in hard water areas, consider filtration at the cold water inlet, which extends the life of the coil and maintains stable flow performance. For variants with a built-in cylinder (HR/HRS), we recommend following standard DHW cylinder maintenance practices, including an occasional check of the anode, if included in the design. The removable insulation allows quick and safe access for all of these servicing tasks without permanently damaging it.

Before initial commissioning, we recommend having the system filled, vented, and set up by a qualified technician, who will also confirm the commissioning date decisive for the warranty period.

Safety and standards

The TUVS600K tank is intended for operation in closed heating systems and must always be supplemented with a safety valve with the appropriate opening pressure, an expansion vessel with sufficient volume, and a venting valve at the highest point of the circuit. Installation, connection, and initial commissioning may only be carried out by a person with the appropriate qualification in accordance with applicable legislation and technical standards for pressure vessels and heating systems. Failure to comply with these principles may lead to a limitation or loss of warranty.

Delivery and installation

We deliver the TUVS600K tank to Slovakia by standard pallet transport; for larger volumes (from approx. 800 l upwards), we recommend checking in advance the passability of doors and corridors along the route to the boiler room – the weight and dimensions in the parameters table are approximate estimates, and we will gladly confirm the exact values for a specific unit before ordering. We recommend leaving the actual connection to the heat source, electric heating element, and controls to a professional installation company.

Who is this solution suitable for

We recommend the TUVS600K tank with a volume of 600 litres especially for family houses and smaller facilities that want to efficiently accumulate heating water while also addressing domestic hot water preparation in the manner typical of the chosen series (TUVS – buffer tank with stainless steel DHW coil and heat exchanger). We recommend consulting the specific choice of volume and variant (AS/HR/HRS/TUV/TUVS) with a heating technician based on the building's heat loss, the number of people in the household, the chosen heat source(s), and the required comfort of hot water preparation.

Frequently asked questions

What is the difference between the TUVS600K tank and the other types in the AS/HR/HRS/TUV/TUVS range?
The TUVS600K tank has a stainless steel coil for instantaneous heating of domestic hot water, complemented by one additional external heat exchanger for charging heating water. The other types in the range differ mainly in whether they have a built-in DHW cylinder (HR, HRS), a stainless steel coil for instantaneous heating (TUV, TUVS), or no hot water preparation at all (AS), and in how many external heat exchangers for charging heating water they contain (0 or 1).

What volume of the TUVS600K tank do I need for a typical family household?
A tank with a volume of 600 litres is intended for households and buildings where accumulation corresponding roughly to this output and consumption range is needed. We always recommend calculating the exact volume based on the building's heat loss, the heat source output, and the number of people in the household – we will gladly help you choose based on specific input data.

What is the surface area of the heat exchanger for charging heating water?
The TUVS600K tank has a heat exchanger with an estimated heat exchange surface of approximately 2.2 m², which, at typical heat source inlet temperatures, is sufficient for efficiently charging the accumulated volume of water within a reasonable time. The exact heat exchanger output depends on the temperature gradient and flow rate on the heat source side.

Why is a stainless steel coil better than a classic DHW cylinder?
Water intended for drinking and cooking constantly flows through the coil and does not remain stagnant in a separate volume for long periods, which significantly reduces the risk of bacterial growth, including legionella. At the same time, there is no need to keep a hot water cylinder in standby mode, which saves energy outside peak demand periods.

Is the TUVS600K tank suitable for a heat pump?
Yes, the tank has an external heat exchanger for charging heating water, which provides the necessary hydraulic separation of the heat pump circuit from the house's heating circuit – a standard connection for ATTACK heat pumps as well as those of other manufacturers.

What is the maximum operating pressure and temperature load of the tank?
The buffer part of the tank is rated for a max. operating pressure of 3 bar and a max. water temperature of 95 °C. The heat exchanger/coil circuit withstands comparable values; you will find the exact maximum parameters in the technical table below, and always also in the accompanying documentation supplied with the tank.

How is the TUVS600K tank insulated, and can the insulation be removed later for servicing?
The tank is fitted with soft removable insulation 100 mm thick in a leatherette cover, which can be easily removed and refitted using hook-and-loop fasteners/straps without damage – useful when connecting ports, servicing, or additionally installing sensors and heating elements.

Can the tank be combined with several heat sources at once (e.g. a heat pump and solar)?
Yes, this is one of the main purposes of a buffer tank with a heat exchanger – it allows combining several heat sources (heat pump, wood gasification boiler, solar system, electric heating element) into a single buffer tank body. We recommend having the exact connection and number of required ports designed by a heating technician according to the specific combination of sources.

Is it possible to install an electric heating element additionally?
Yes, the tank has a prepared port with a G 6/4" thread for ATTACK TH electric heating elements (e.g. TH100, TH102, TH103, TH107 with an output of 2–6 kW), which serve as a backup or supplementary heat source.

Is the price difference between AS, HR, HRS, TUV, and TUVS just about additional equipment?
Yes, the price difference between the individual variants of the same volume reflects the amount of built-in components – a built-in enamelled DHW cylinder (HR/HRS), a stainless steel coil (TUV/TUVS), and/or an additional external heat exchanger (HRS/TUVS compared to HR/TUV). The more functions the tank integrates, the higher the purchase price, but at the same time you don't need to buy and install separate additional devices.

How does ordering and delivery of the TUVS600K tank work?
After ordering, we dispatch the tank from the manufacturing warehouse in Slovakia, and we will inform you of the delivery date by email or phone. If you are interested, we can also recommend compatible accessories (ATTACK TH electric heating elements, circulation pumps, controls) so that you receive a complete functional set in a single order.

Warranty

We provide a 24-month warranty period for the TUVS600K buffer tank from the date of commissioning, but no more than 30 months from the date of dispatch from the factory. If you have any questions about choosing, connecting, or servicing the tank, do not hesitate to contact our sales department – we will gladly help design the entire set, including the heat source, circulation pumps, and controls.