ATTACK TUV 1000 Storage Tank with Stainless Steel Coil for DHW Heating (insulation included)

Product detailed description

ATTACK TUV 1000 Buffer Tank with Stainless Steel Coil for DHW Heating (insulation included)

ATTACK buffer tanks with heat exchanger form a complete range of five solutions, which differ from one another in the method of domestic hot water (DHW) preparation and the number of built-in heat exchangers for charging the heating water. This choice is exactly what determines how easily, 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 a single heat exchanger, purely for heating accumulation. It has no built-in DHW preparation, and is used 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 then handled by an external tank (e.g. the ATTACK Z series).
• HR – a tank with a built-in enamelled DHW tank with a volume of 160 l inside the buffer body (a "tank-in-tank" principle). It contains no additional heat exchanger – heating water is fed directly into the buffer tank, which makes it best suited to 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 DHW tank, 160 l), supplemented with one additional external heat exchanger for charging the 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 provides instantaneous heating of domestic hot water – cold water flows through the coil and is heated immediately, without the need for a separate DHW tank. Heating water is fed directly, with no additional heat exchanger.
• TUVS – a combination of TUV (stainless steel coil for instantaneous DHW heating) and one additional external heat exchanger for charging the heating water – the most versatile solution in the range, also suitable for heat sources requiring hydraulic separation (heat pump, combination of multiple sources).

ATTACK TUV 1000 Buffer Tank with Stainless Steel Coil for DHW Heating (insulation included) belongs to the ATTACK range of buffer tanks with heat exchanger in the 1000-litre volume category. It is the TUV – buffer tank with stainless steel coil for instantaneous DHW heating variant – a stainless steel coil inside the tank for instantaneous heating of domestic hot water, with no additional heat exchanger – heating water is fed directly. This page describes exactly this specific model, including its technical parameters, recommended heat sources, and the most frequent customer questions.

Key features

• Removable soft insulation, 100 mm thick, in a durable leatherette (PVC) cover – easily removed and refitted during connection servicing, without the need for permanent damage to the tank surface.
• Internal stainless steel coil for instantaneous (hygienic) heating of domestic hot water, with an estimated heat exchange area of approx. 3.6 m² – no stagnant water, minimal risk of bacterial growth including legionella.
• External heat exchanger for charging heating water, with an estimated heat exchange area of approx. 3.6 m², enabling hydraulic separation of the heat source (e.g. a heat pump) from the heating circuit.
• Welded steel body with anti-corrosion internal coating, 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. 7 in total) for connecting the heat source(s), heating circuits, temperature sensors and air venting – exact port layout according to manufacturing documentation.
• Compact footprint with a height/diameter ratio optimised to pass through standard doors and stairways during installation in a boiler room or utility room.
• Possibility of combining several heat sources at once (heat pump, wood gasification boiler, solar system, electric 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 with a thickness of 100 mm and a practical leatherette cover, the tank retains water temperature over the long term even outside the heating season, and accessing the insulation for connection servicing is easy – the insulation can be removed and refitted at any time without damage. Instantaneous heating via the stainless steel coil means practically unlimited domestic hot water without the risk of bacterial overgrowth (legionella) typical of stagnant water in a classic tank, since the water in the coil does not stagnate. Without a heat exchanger on the heating water side, the TUV is suitable for sources with their own circulation pump, e.g. ATTACK DPX/SLX gasification boilers connected directly.

The TUV1000K tank is suitable for combination 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 need an external indirect DHW tank for hot water preparation (these boilers do not contain a tank themselves). For exact sizing of pipework, pumps and safety fittings, we always recommend having this assessed by an authorised heating engineer according to the project documentation of the specific building.

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

How to properly size the buffer tank volume

The buffer tank volume should be based primarily on the heat source output, the heat loss of the heated building, and the mode of operation. For wood gasification boilers (e.g. ATTACK DPX/SLX), a guideline of approximately 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 need for heat 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 a smaller volume than for wood boilers is usually sufficient. The TUV1000K model with a volume of 1000 litres is suitable as a guideline for a heat source with output in the corresponding range – however, we always recommend having the exact calculation done by a heating engineer based on the energy label or a heat calculation for the specific building, not just a table estimate.

Other volumes in the same TUV variant

If a volume of 1000 litres is not exactly what you are looking for, we also offer the same design solution (a stainless steel coil inside the tank for instantaneous heating of domestic hot water, with no additional heat exchanger – heating water is fed directly) in our shop in other volume ranges:

• ATTACK TUV 500 Buffer Tank with Stainless Steel Coil for DHW Heating (insulation included) – 500 l
• ATTACK TUV 600 Buffer Tank with Stainless Steel Coil for DHW Heating (insulation included) – 600 l
• ATTACK TUV 800 Buffer Tank with Stainless Steel Coil for DHW Heating (insulation included) – 800 l

A larger volume means a longer accumulation time and fewer charge/discharge 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 is, conversely, cheaper and more compact, but if undersized, the heat source may switch on more frequently.

Maintenance and operation

The TUV1000K 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 coil's service life and maintains stable flow performance. For variants with a built-in tank (HR/HRS), we recommend following the usual DHW tank maintenance principles, including occasional inspection of the anode if included in the design. The removable insulation allows quick and safe access for all these service tasks without permanent damage.

Before initial commissioning, we recommend having the system filled, vented and set up by an authorised technician, who will also confirm the commissioning date, which is decisive for the start of the warranty period.

Safety and standards

The TUV1000K tank is designed for operation in closed heating systems and must always be supplemented with a safety valve with the appropriate opening pressure, an expansion vessel of sufficient volume, and an air vent valve at the highest point of the circuit. Installation, connection and initial commissioning may only be carried out by a person with the appropriate authorisation in accordance with applicable legislation and technical standards for pressure vessels and heating systems. Failure to observe these principles may lead to limitation or loss of the warranty.

Delivery and installation

We deliver the TUV1000K tank to Slovakia by standard pallet transport; for larger volumes (from approx. 800 l upwards), we recommend checking in advance whether doors and corridors along the route to the boiler room are wide enough – the weight and dimensions given in the parameters table are estimates, and we will be happy to confirm the exact values for a specific unit before ordering. We recommend entrusting the actual connection to the heat source, electric heating element and controls to a professional installation company.

Who this solution is suitable for

We recommend the TUV1000K tank with a volume of 1000 litres primarily for family homes and smaller facilities that want to efficiently accumulate heating water while also solving domestic hot water preparation in the manner typical for the chosen series (TUV – buffer tank with stainless steel coil for instantaneous DHW heating). We recommend consulting the specific choice of volume and variant (AS/HR/HRS/TUV/TUVS) with a heating engineer according to the building's heat loss, the number of people in the household, the chosen heat source(s), and the desired level of hot water comfort.

Frequently asked questions

What is the difference between the TUV1000K tank and the other types in the AS/HR/HRS/TUV/TUVS range?
The TUV1000K tank has a stainless steel coil inside the tank for instantaneous heating of domestic hot water, with no additional heat exchanger – heating water is fed directly. The other types in the range differ mainly in whether they have a built-in DHW tank (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 TUV1000K tank do I need for a typical family household?
A tank with a volume of 1000 litres is intended for households and buildings requiring accumulation corresponding roughly to this output and consumption range. We always recommend calculating the exact volume according to the building's heat loss, the heat source output, and the number of people in the household – we will be happy to help you choose based on your specific input data.

What is the area of the heat exchanger for charging the heating water?
The TUV1000K tank has a heat exchanger with an estimated heat exchange area of approximately 3.6 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 performance depends on the temperature gradient and flow rate on the heat source side.

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

Is the TUV1000K tank suitable for a heat pump?
Yes, the tank has an external heat exchanger for charging the heating water, which provides the necessary hydraulic separation of the heat pump circuit from the house's heating circuit – a standard connection method 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 section 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; exact maximum parameters can be found in the technical table below and always also in the accompanying documentation supplied with the tank.

How is the TUV1000K tank insulated, and can the insulation be removed later for servicing?
The tank is equipped with soft removable insulation, 100 mm thick, in a leatherette cover, which is easily removed and refitted using hook-and-loop fasteners/straps without damage – useful when connecting ports, performing service work, 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, that is one of the main functions 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 body. We recommend having the exact connection scheme and the number of required ports designed by a heating engineer according to the specific combination of sources.

Is it possible to additionally install an electric heating element?
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 only due to additional equipment?
Yes, the price difference between the individual variants of the same volume reflects the number of built-in components – a built-in enamelled DHW tank (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 TUV1000K tank work?
After ordering, we dispatch the tank from the factory warehouse in Slovakia, and we will inform you of the delivery date by e-mail 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 warranty period of 24 months from the date of commissioning for the TUV1000K buffer tank, 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, please do not hesitate to contact our sales department – we will be happy to help design the entire system, including the heat source, circulation pumps, and controls.