ATTACK HRS 1000 Buffer Tank with Built-in 160L DHW Tank and One Heat Exchanger (insulation included)

Product detailed description

ATTACK Buffer Storage Tank HRS 1000 with built-in 160L DHW tank and one heat exchanger (insulation included)

ATTACK buffer storage tanks with a heat exchanger form a comprehensive range of five solutions, which differ from each other in the method of preparing domestic hot water (DHW) and the number of built-in heat exchangers for charging heating water. It is precisely this choice that 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 water accumulation. It has no built-in DHW preparation inside, and serves exclusively for the accumulation of heating water and hydraulic separation of the heat source (e.g. a heat pump or a gasification boiler) from the heating circuit. In this case, hot water preparation is solved using an external tank (e.g. the ATTACK Z range).
• HR – a tank with a built-in enamelled DHW tank with a volume of 160 l inside the buffer tank body (the "tank-in-tank" principle). It does not contain any additional heat exchanger – heating water is fed directly into the buffer tank, so it is especially 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 tank 160 l), complemented by one additional external heat exchanger for charging heating water. Thanks to this heat exchanger, HRS is also suitable for heat sources requiring hydraulic separation, for example a heat pump.
• TUV – a tank with a stainless steel coil inside, which ensures 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 tank. 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 additional external heat exchanger for charging heating water – the most universal solution in the range, suitable also for heat sources requiring hydraulic separation (heat pump, combination of multiple sources).

ATTACK Buffer Storage Tank HRS 1000 with built-in 160L DHW tank and one heat exchanger (insulation included) belongs to the ATTACK range of buffer storage tanks with a heat exchanger in the 1000-litre volume category. It is the HRS – buffer storage tank with a built-in DHW tank and heat exchanger variant – a built-in enamelled DHW tank with a volume of 160 l inside the tank, 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 with a thickness of 100 mm in a durable leatherette (PVC) cover – easy to remove and reattach during connection servicing, without permanently damaging the tank surface.
• Built-in enamelled domestic hot water tank with a volume of 160 l inside the buffer tank body (the "tank-in-tank" principle) – hot water prepared directly inside the tank body without the need for a separate external boiler.
• External heat exchanger for charging heating water with an estimated heat transfer area of approx. 3.0 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, designed for a max. operating pressure of 3 bar and a water temperature of up to 95 °C.
• A prepared port with a G 6/4" thread for installing the ATTACK TH electric heating element (2–6 kW) as a backup or supplementary heat source.
• Multiple ports (approx. 9 in total) for connecting the heat source(s), heating circuits, temperature sensors and venting – exact port layout according to the manufacturer's documentation.
• Compact footprint with a height/diameter ratio optimised for passing through standard doors and staircases when installing in a boiler room or utility room.
• Possibility of combining multiple 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 the date of dispatch from production).

Technical parameters

Installation recommendations

Thanks to the removable soft insulation with a thickness of 100 mm and a practical leatherette cover, the tank keeps the water temperature stable for a long time even outside the heating season, and access to the insulation for connection servicing is easy – the insulation can be removed and reattached at any time without damage. The added external heat exchanger makes HRS a more versatile choice than HR – it is also suitable for heat sources requiring hydraulic separation, for example a heat pump, while retaining the convenience of the built-in 160 l DHW tank without the need for an external boiler.

The HRS1000K 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 gas cast-iron boilers, which need an external indirect DHW tank for DHW preparation (these boilers do not contain a tank themselves). 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.

During installation, allow for sufficient space around the tank for service access to the ports, sensors and a possible 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 primarily be based on the output of the heat source, 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 out at full output even outside the 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 is usually sufficient than with wood boilers. The HRS1000K model with a volume of 1000 litres is roughly suitable for a heat source with output within the relevant 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 according to a table estimate.

Other volumes in the same HRS 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 tank with a volume of 160 l inside the tank, complemented by one additional external heat exchanger for charging heating water) in our online store in other volume ranges:

• ATTACK Buffer Storage Tank HRS 600 with built-in 160L DHW tank and one heat exchanger (insulation included) – 600 l
• ATTACK Buffer Storage Tank HRS 800 with built-in 160L DHW tank and one heat exchanger (insulation included) – 800 l

A larger volume means a longer accumulation time and fewer charging/discharging cycles per day, which saves 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 switch on more frequently.

Maintenance and operation

The HRS1000K 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 harder water, to consider filtration at the cold water inlet, which extends the life of the coil and maintains a stable flow output. For variants with a built-in tank (HR/HRS), we recommend following standard 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 of 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 warranty period.

Safety and standards

The HRS1000K 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 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 HRS1000K tank to Slovakia by standard palletised 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 parameter table are approximate 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 control system to a professional installation company.

Who is this solution suitable for

We recommend the HRS1000K 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 the manner typical of the chosen series (HRS – buffer storage tank with a built-in DHW tank and heat exchanger). We recommend consulting the specific choice of volume and variant (AS/HR/HRS/TUV/TUVS) with a heating technician according to the heat loss of the building, 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 HRS1000K tank and other types in the AS/HR/HRS/TUV/TUVS range?
The HRS1000K tank has a built-in enamelled DHW tank with a volume of 160 l inside the tank, 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 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 the HRS1000K tank do I need for a typical family household?
A tank with a volume of 1000 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 according to the heat loss of the building, the output of the heat source, and the number of people in the household – we are happy to help you choose based on specific input data.

What is the area of the heat exchanger for charging heating water?
The HRS1000K tank has a heat exchanger with an estimated heat transfer area of approximately 3.0 m², which, at typical inlet temperatures of the heat source, is sufficient for efficiently charging the accumulated volume of water within a reasonable time. The exact output of the heat exchanger depends on the temperature difference and flow rate on the heat source side.

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

Is the HRS1000K 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 heat pumps from ATTACK as well as other manufacturers.

What is the maximum operating pressure and temperature load of the tank?
The buffer part 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 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 HRS1000K tank insulated, and can the insulation be removed later for servicing?
The tank is equipped with soft removable insulation with a thickness of 100 mm in a leatherette cover, which can be easily removed and reattached using hook-and-loop fasteners/straps without damage – useful when connecting ports, performing servicing, or additionally installing sensors and heating elements.

Can the tank be combined with multiple heat sources at once (e.g. a heat pump and solar)?
Yes, that is one of the main functions of a buffer storage tank with a heat exchanger – it allows combining multiple 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 the number of ports needed designed by a heating technician 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 a 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 HRS1000K tank work?
After ordering, we dispatch the tank from the production warehouse in Slovakia and inform you of the delivery date by email or phone. If 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 HRS1000K buffer storage tank from the date of commissioning, but no more than 30 months from the date of dispatch from production. If you have any questions about choosing, connecting or servicing the tank, please 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.