ATTACK HR 1000 Storage Tank with Built-in Enamelled 160L DHW Cylinder (insulation included in price)

Product detailed description

ATTACK Buffer Tank HR 1000 with built-in enamelled 160L DHW cylinder (insulation included)

ATTACK buffer tanks with heat exchanger form a complete range of five solutions that differ from each other in the way domestic hot water (DHW) is prepared and in the number of built-in heat exchangers for charging the 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 – tank with one heat exchanger, purely heating accumulation. It has no built-in DHW preparation, and serves exclusively for heating water storage and hydraulic separation of the heat source (e.g. a heat pump or gasification boiler) from the heating circuit. Hot water preparation is in this case handled by an external cylinder (e.g. the ATTACK Z range).
• HR – tank with a built-in enamelled DHW cylinder with a volume of 160 l inside the storage body (“tank-in-tank” principle). It contains no additional heat exchanger – heating water is fed directly into the buffer tank, which makes it most suitable 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 DHW cylinder 160 l), supplemented with one additional external heat exchanger for charging the heating water. Thanks to this heat exchanger, HRS is also suitable for heat sources requiring hydraulic separation, such as a heat pump.
• TUV – tank with a stainless steel coil inside, which provides instantaneous (flow-through) 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 directly, without any 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, suitable for heat sources requiring hydraulic separation (heat pump, combination of multiple sources).

ATTACK Buffer Tank HR 1000 with built-in enamelled 160L DHW cylinder (insulation included) belongs to the range of ATTACK buffer tanks with heat exchanger in the 1000-litre volume category. It is the HR – buffer tank with built-in enamelled DHW cylinder variant – a built-in enamelled DHW cylinder with a volume of 160 l inside the tank (“tank-in-tank” principle), without any additional heat exchanger – heating water is fed in 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 with a thickness of 100 mm in a durable leatherette (PVC) cover – easily removed and refitted during connection servicing, without permanently damaging the tank surface.
• Built-in enamelled domestic hot water cylinder with a volume of 160 l inside the storage body (“tank-in-tank” principle) – hot water prepared directly within the tank body without the need for a separate external water heater.
• No heat exchanger on the heating water side – direct connection of the heat source with its own circulation pump (typically a solid fuel boiler), simpler and cheaper connection.
• Steel welded body with anti-corrosion internal coating, designed for a max. operating pressure of 3 bar and water temperature up to 95 °C.
• Prepared port with a G 6/4" thread for installation of an ATTACK TH electric heating element (2 – 6 kW) as a backup or supplementary heat source.
• Multiple ports (approx. 8 in total) for connecting the heat source(s), heating circuits, temperature sensors and air venting – exact port layout according to the manufacturer's documentation.
• Compact footprint with a height/diameter ratio optimised for passing through standard doorways and staircases when installed in a boiler room or utility room.
• Possibility of combining multiple heat sources at the same time (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 with a thickness of 100 mm and a practical leatherette cover, the tank retains water temperature well over the long term even outside the heating season, and access to the insulation for servicing connections is easy – the insulation can be removed and refitted at any time without damage. Since HR has no heat exchanger for charging the heating water, it is most suitable for heat sources with their own circulation pump and no need for hydraulic separation – typically solid fuel boilers (wood, coal) or ATTACK DPX/SLX gasification boilers connected directly into the tank circuit. The built-in 160 l enamelled cylinder covers the typical operating hot water consumption of a household without the need for an additional cylinder.

The HR1000K 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 stationary cast-iron gas boilers ATTACK EKO/PLQ/KLQ/E/EZ COMBI, which require an external indirect water heater for DHW preparation (these boilers themselves do not contain a cylinder). We always recommend having the exact sizing of pipework, pumps and safety fittings assessed by an authorised 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 an air vent 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 output of the heat source, the heat loss of the building being heated, and the mode of operation. 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 demand 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 HR1000K model with a volume of 1000 litres is suitable, roughly speaking, for a heat source with an output in 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 HR variant

If a volume of 1000 litres is not exactly what you are looking for, we also offer the same design solution (a built-in enamelled DHW cylinder with a volume of 160 l inside the tank (“tank-in-tank” principle), without any additional heat exchanger – heating water is fed in directly) in our shop in other volume ranges:

• ATTACK Buffer Tank HR 600 with built-in enamelled 160L DHW cylinder (insulation included) – 600 l
• ATTACK Buffer Tank HR 800 with built-in enamelled 160L DHW cylinder (insulation included) – 800 l

A larger volume means a longer accumulation time and fewer charging/discharging cycles per day, which is easier on the heat source, but at the same time 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 HR1000K 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 the case of harder water, consider filtration at the cold water inlet, which extends the life of the coil and maintains stable flow-through performance. For variants with a built-in cylinder (HR/HRS), we recommend following standard DHW cylinder maintenance practices, 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 permanently damaging it.

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

Safety and standards

The HR1000K 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 an air vent at the highest point of the circuit. Installation, connection and first commissioning may only be carried out by a person with the appropriate authorisation in accordance with current legislation and technical standards for pressure vessels and heating systems. Failure to observe these principles may lead to a limitation or loss of the warranty.

Delivery and installation

We deliver the HR1000K tank within Slovakia by standard palletised transport; for larger volumes (from approx. 800 l upwards), we recommend checking in advance the clearance of doors and corridors along the route to the boiler room – the weight and dimensions in the parameter table are approximate estimates, and we will gladly confirm the exact values for a specific unit before ordering. We recommend entrusting the actual connection to the heat source, electric heating element and control system to a professional installation company.

Who this solution is suitable for

We recommend the HR1000K tank with a volume of 1000 litres especially for family houses and smaller operations that want to efficiently accumulate heating water while also solving domestic hot water preparation in a way typical for the chosen series (HR – buffer tank with built-in enamelled DHW cylinder). We recommend consulting the specific choice of volume and variant (AS/HR/HRS/TUV/TUVS) with a heating technician according to the building's heat loss, the number of people in the household, the heat source(s) chosen, and the desired level of hot water comfort.

Frequently asked questions

What is the difference between the HR1000K tank and the other types in the AS/HR/HRS/TUV/TUVS range?
The HR1000K tank has a built-in enamelled DHW cylinder with a volume of 160 l inside the tank (“tank-in-tank” principle), without any additional heat exchanger – heating water is fed in directly. 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 the heating water they contain (0 or 1).

What tank volume of HR1000K do I need for a typical family household?
A tank with a volume of 1000 litres is intended for households and buildings that require accumulation corresponding roughly to this output and consumption range. 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 are happy to help you choose based on specific input data.

Why does the HR1000K tank have no heat exchanger for charging the heating water?
This type is designed for direct connection of the heat source (without the need for hydraulic separation), typically to a solid fuel boiler with its own circulation pump. If you are planning a heat source that requires hydraulic separation (e.g. a heat pump), choose instead a variant with an added heat exchanger (HRS instead of HR, or TUVS instead of TUV).

Is the built-in 160 l cylinder sufficient for hot water for the whole household?
The built-in enamelled cylinder with a volume of 160 l covers the typical operating consumption of a standard household (approx. 3 – 5 people) with adequate reheating. For higher peak consumption (e.g. several bathrooms at the same time), we recommend adding an external DHW cylinder or considering the TUV/TUVS variant with instantaneous heating, which is not limited by volume.

Is the HR1000K tank suitable for a heat pump?
Direct connection without a heat exchanger is intended more for sources with their own circulation pump (e.g. solid fuel boilers). For a heat pump, which typically requires hydraulic separation, we recommend choosing the related variant with an added heat exchanger (HRS instead of HR, or TUVS instead of TUV) from the same ATTACK range.

What is the maximum operating pressure and temperature load of the tank?
The buffer section of the tank is designed for a max. operating pressure of 3 bar and a max. water temperature of 95 °C. The heat exchanger/coil circuit can withstand 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 HR1000K tank insulated, and can the insulation be removed later for servicing?
The tank is fitted with soft removable insulation with a thickness of 100 mm in a leatherette cover, which is easily removed and refitted using hook-and-loop fasteners/straps without damage – useful when connecting ports, during servicing, or when 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 purposes of a buffer tank with a heat exchanger – it allows you to combine multiple heat sources (heat pump, wood gasification boiler, solar system, electric heating element) into a single storage body. We recommend having the exact connection and the required number of ports designed by a heating technician according to the specific combination of sources.

Is it possible to additionally fit 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 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 do not need to buy and install separate additional devices.

How does ordering and delivery of the HR1000K tank work?
After ordering, we dispatch the tank from the manufacturing 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 24-month warranty period on the HR1000K 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 are happy to help design the whole set including the heat source, circulation pumps and control system.