ATTACK Z 200 HP Tank - grey insulation
Code: Z200HPProduct detailed description
ATTACK Z 200 HP - DHW storage tank for heat pumps
The Z 200 HP model belongs to a range of storage tanks designed directly for cooperation with air-to-water or ground-to-water heat pumps. A capacity of 200 litres combined with a large-area heat exchanger makes this tank a reliable solution for domestic hot water preparation, even in low-energy houses where the main heating source is a heat pump.
Why a heat pump needs a different storage tank than a gas boiler
A gas or electric boiler can easily supply heating water at a temperature of 70-80 °C, so a standard boiler-connected tank only needs a smaller heat exchanger - the temperature difference between the heating water and the water in the tank is large, and heat transfer is fast even through a smaller surface area. A heat pump, on the other hand, works best with a low outlet heating water temperature (typically 35-55 °C) for reasons of energy efficiency - the higher the temperature a heat pump has to produce, the lower its coefficient of performance (COP) and the higher its electricity consumption.
If you connected a heat pump to a standard boiler tank with a small heat exchanger, the pump would have to produce water at a higher temperature so that enough heat could pass through the small surface area in a reasonable time - this would significantly reduce its efficiency and increase operating costs. The Z 200 HP tank therefore uses a heat exchanger with a substantially larger heat transfer surface, which allows efficient heat transfer even at a low temperature difference between the heat pump (e.g. 45 °C) and the water in the tank (e.g. from 40 °C to 50 °C).
Key features
- 200-litre capacity, grey insulation, vertical design
- Large-area heat exchanger optimised for low heat pump outlet temperatures
- Maintains high heat pump COP even during DHW preparation
- Enamelled steel tank with magnesium anode
- Rigid PU insulation with low heat losses
- Built-in sleeve for the heat pump control temperature sensor
- Ready for the addition of a 6/4" electric heating element as a backup/bivalent source
- Also compatible with a conventional boiler if you change the heating source later
Technical parameters
| Tank type | indirectly heated, large-area heat exchanger for heat pumps |
| Capacity | 200 l |
| Orientation | vertical |
| Tank material | steel, enamelled surface |
| Corrosion protection | magnesium anode |
| Insulation | rigid PU foam, grey casing |
| Dimensions (diameter x height) | 600 x 1250 mm (approximate) |
| Weight (empty) | 68.000 kg (estimated) |
| DHW/heating connection | 6/4" |
| Recommended heat source | heat pump (35-55 °C outlet) |
| Maximum DHW operating temperature | 95 °C |
| Maximum DHW operating pressure | 0.6 MPa |
| Country of origin | Slovakia |
| Manufacturer | ATTACK s.r.o. |
| Warranty | 5 years on the tank / 24 months on other parts |
Installation and setup
The Z 200 HP tank is placed on the floor of the utility room as close as possible to the indoor unit of the heat pump, to minimise heat losses in the piping between the pump and the tank. Connection of the heat exchanger to the heat pump circuit is carried out by the heat pump installation company according to its manual - it is important to set DHW priority heating in the heat pump control system and to correctly position the temperature sensor in the tank's sleeve.
We also recommend adding an electric heating element (ATTACK TH) via the free 6/4" flange as a bivalent source for extremely cold days, when the heat pump's output decreases, or for the regular thermal disinfection function (anti-legionella program) at a temperature above 60 °C, which the heat pump itself usually cannot achieve efficiently.
Maintenance and service life
Checking the magnesium anode once a year also applies to this model. We also recommend regularly (according to the heat pump manufacturer's instructions) performing thermal disinfection of the tank at a temperature above 60 °C, if not active automatically, as a prevention against the proliferation of legionella bacteria, which can multiply particularly at the lower operating temperatures typical of heat pumps.
Step-by-step commissioning procedure
- Place the tank on the floor as close as possible to the indoor unit of the heat pump
- Connect the large-area heat exchanger to the heat pump circuit according to its manual
- Insert the heat pump control temperature sensor into the tank's sleeve
- Connect the cold and hot water piping with the DHW safety valve (max. 0.6 MPa)
- Optionally add and connect an electric heating element as a bivalent source
- Fill and vent the tank as well as the heat pump circuit
- Set DHW priority heating and temperature in the heat pump control system
- Set and test any thermal disinfection (anti-legionella program)
- Pressure test, leak check, and hand over documentation to the user
Safety warnings
The DHW safety valve (0.6 MPa) must always remain functional, and its outlet must freely discharge any overpressure. Electrical connection of the heat pump and any additional electric heating element must be carried out by a qualified electrician. For DHW preparation using a heat pump, we recommend setting up regular thermal disinfection above 60 °C (e.g. once a week) as prevention against the proliferation of legionella bacteria, since the normal operating temperature with a heat pump (45-55 °C) is more favourable for their growth than the higher temperatures common with boilers.
Operating economics
The main economic advantage of the Z 200 HP tank is maintaining a high coefficient of performance (COP) of the heat pump even during DHW preparation, thanks to the large-area heat exchanger. With a standard boiler tank with a small heat exchanger, the heat pump would have to work with a higher outlet temperature, which for air-to-water types can reduce COP from around 3.5-4 to 2.5-3 or lower, significantly increasing electricity consumption for preparing the same amount of hot water. A properly sized tank for a heat pump therefore pays off in the long run, despite a higher initial price compared to a standard boiler tank.
Who the Z 200 HP is suitable for
This tank is intended primarily for households with an air-to-water or ground-to-water heat pump as the main source of heating and DHW preparation. A capacity of 200 litres will cover the typical consumption of a 2-4 person household. If you plan to add a heat pump in the future, we recommend choosing this model straight away instead of a standard boiler tank.
How to navigate the ATTACK Z / PZO range of tanks
The ATTACK brand offers several types of hot water storage tanks, which differ in their heating method and purpose. Below is a brief overview to help you navigate when choosing a related or replacement product:
- Z .. OKC / OKCV - Basic indirectly heated tank with a single heat exchanger, connected to a boiler. The simplest and most affordable DHW preparation solution if you already have or plan to have a boiler.
- Z .. OKC ENTR HV 2,2 - Same principle as OKC, plus a built-in 2.2 kW electric heating element - a choice for cottages, summer operation without a boiler, or as a backup in case of boiler failure.
- Z .. SOL - Two heat exchangers - a boiler exchanger and a large-area solar exchanger. A choice for households with solar collectors who want to make use of free solar heat as well.
- Z .. HP ▸ this is the exact product you are viewing - A single large-area heat exchanger optimised for low heat pump outlet temperatures. A choice for households with a heat pump as the main heat source.
- PZO .. PLUS - Directly heated, with its own gas burner, requiring no boiler at all. A choice for cottages, workshops, and premises without central heating.
For all indirectly heated variants (OKC, ENTR, SOL, HP), the heating output can be supplemented or backed up with an ATTACK TH electric heating element (2/2.5/4.5/6 kW outputs) via a 6/4" flange, which is available in our range as a separate product.
Common mistakes in selection and installation
The most common and costly mistake is using a standard boiler tank with a small heat exchanger in combination with a heat pump - such a solution works, but in the long run it increases electricity consumption and reduces the pump's lifespan due to the need for a higher outlet temperature. Other mistakes include the lack of regular thermal disinfection (risk of legionella at low operating temperatures) and incorrectly set DHW heating priority in the heat pump control system. For the Z 200 HP model, we recommend having the sizing of the tank capacity and heat pump output assessed by a professional installation company already at the project stage.
Frequently asked questions
Can I use this tank with a gas boiler as well?
Yes, the large-area heat exchanger works fine with a boiler too, but its advantage (efficient heat transfer at low temperature) is fully utilised specifically with a heat pump.
Why should I pay more for a tank designed for a heat pump?
The higher price pays off through lower heat pump electricity consumption - with a small heat exchanger, the pump would have to work with a higher outlet temperature and lower COP throughout its operation, which in the long run increases operating costs much more than the price difference of the tank.
Can the heat pump reach 60°C in this tank for anti-legionella protection?
Most heat pumps can reach a higher temperature, but with lower efficiency. For reliable thermal disinfection, we recommend adding an electric heating element, which can quickly and reliably reach 60 °C and above.
Is a special temperature sensor required?
Yes, the heat pump control system needs its own temperature sensor placed in the tank's sleeve, which is supplied with the heat pump, not with the tank itself.
How large a tank do I need for my heat pump?
The recommended capacity depends on the heat pump's output and the number of people in the household; 200 litres is a common choice for a smaller family house, but we recommend consulting the exact sizing with your heat pump supplier.
Can I also add an electric heating element as a backup source?
Yes, the tank has a free 6/4" flange ready for installing an ATTACK TH electric heating element as a bivalent source for cold days or thermal disinfection.
How often should the anode be checked when operating with a heat pump?
The recommended check is the same as for other tanks - once a year, or more frequently with harder water.
Is the tank also suitable for ground-to-water heat pumps, not just air-to-water?
Yes, the large-area heat exchanger is suitable for any type of heat pump with a low heating water outlet temperature, i.e. both air-to-water and ground-to-water (brine-to-water).
By how much does the COP decrease when using a standard boiler tank instead of the HP model?
The exact value depends on the specific heat pump, but as a general guide, the drop in COP during DHW preparation can reach 20-35%, which translates into higher electricity consumption for the same level of hot water comfort.
How often should thermal disinfection against legionella be performed?
The recommended frequency is usually once a week at a temperature above 60 °C; the exact recommendation depends on the heat pump manufacturer's instructions and local hygiene regulations.
Can I later connect the tank to a different heat source?
Yes, the large-area heat exchanger is universal and also works with a boiler, so a future change of heating source does not require replacing the tank.
Is this model compatible with all heat pump brands?
Yes, the connection is made via a standard water piping interface of the heat exchanger, which is compatible with heat pumps of any brand; we recommend verifying the specific connection parameters with your heat pump installation company.
How much larger is the heat exchanger surface compared to a standard boiler tank?
The large-area heat exchanger typically has a heat transfer surface that is tens of percent larger than a standard boiler exchanger of the same capacity; the exact ratio depends on the specific design.
Effect of heating water temperature on DHW heating output
The actual DHW heating output of the Z 200 HP tank depends on the temperature gradient between the heating water from the heat pump and the water temperature in the tank. At low outdoor temperatures, both the output and the outlet temperature of the heat pump decrease, which can extend the time needed to heat the entire volume. This is exactly why the large-area heat exchanger is so important - it maintains sufficient heat transfer even at a lower temperature gradient, whereas a standard boiler exchanger would mean noticeably slower heating or the need to raise the heat pump's outlet temperature at the expense of its efficiency.
Comparison of Z 200 HP and Z 300 HP capacities
The HP range is offered in capacities of 200 and 300 litres. The smaller 200 l capacity is suitable for a 2-4 person household with normal consumption, while the larger 300 l capacity is recommended for households with more people or higher comfort requirements (multiple bathrooms, simultaneous showering and bath filling). Since a heat pump heats water more slowly than a gas boiler, it is worth choosing a larger tank capacity for higher expected consumption, so the system has a sufficient supply of hot water even at peak demand without waiting for reheating.
Summary
The ATTACK Z 200 HP is the right choice of storage tank for any household with a heat pump - the large-area heat exchanger ensures that the investment in the heat pump fully realises its potential in DHW preparation as well, without any unnecessary loss of efficiency caused by an undersized heat exchanger. The combination of a heat pump with a properly sized Z 200 HP tank is among the most efficient and environmentally friendly ways of preparing hot water available on the market.
Warranty and service
The manufacturer ATTACK provides a 5-year warranty on the tank from the date of sale, subject to compliance with the conditions stated in the warranty certificate (regular anode inspection, compliance with maximum operating pressure and temperature, installation of safety equipment in accordance with applicable legislation). A standard warranty period of 24 months applies to the other components of the tank (insulation, casing, electrical components, sensors, accessories). Service and spare parts for the entire ATTACK range are provided by a network of authorised service partners in Slovakia and the Czech Republic; our team will be happy to help you choose the right part or find the nearest service centre if needed.
Additional parameters
| Category: | Attack |
|---|---|
| Weight: | 68 kg |
| Tank type: | Indirectly heated, large-area heat exchanger |
| Capacity: | 200 l |
| Recommended heat source: | Heat pump (35-55 °C) |
| Tank material: | Enamelled steel |
| Corrosion protection: | Magnesium anode |
| Dimensions (diameter x height, estimated): | 600 x 1250 mm |
| Weight (estimated): | 68.000 kg |
| Connection: | 6/4" |
| Max. DHW operating pressure: | 0.6 MPa |
| Max. DHW temperature: | 95 °C |
| Insulation: | rigid PU foam, grey casing |
| Number of heat exchangers: | 1 (large-area) |
| Country of origin: | Slovakia |
| Manufacturer: | ATTACK s.r.o. |
| Warranty: | 5 years on the tank / 24 months on other parts |
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About the company
The product ATTACK is manufactured using the most modern production technologies available to us. As the most significant Slovak manufacturer of heating technology with purely Slovak capital and a single owner, we fully understand that each production process is reflected in the lifespan of this product and, of course, in your satisfaction. Therefore, we use only the best – from special boiler sheet metal through precise laser cutting of materials, to the most important – waterproof welds, which we perform exclusively robotically in precise fixtures, thus eliminating the human factor. All ATTACK products are high-quality premium products made using the most modern technology based on the latest research. The products have quality certificates from renowned testing laboratories and meet the conditions for the allocation of state subsidies.
History of the company ATTACK
The production site of the company is located in the northern part of central Slovakia, about 20 km from the city of Žilina. Our company, which is engaged in the production of heating technology, started production in 1995 with stationary boilers and gradually expanded its production to today's level, where it produces a wide range of wall-mounted condensing boilers, stationary boilers, solid fuel boilers and TÚV tanks. The company ranks among medium-sized companies covering an area of approximately 5000 m2 covered area and about 1000 m2 uncovered area. Boiler production takes place in our own production halls and has its own development, design, sales and export to foreign markets.
Company profile and vision
“The main goal and philosophy of the company is to develop top products with the highest quality, functionality and design, which achieve the highest combustion efficiency with regard to the environment while maintaining a favorable price.“
The company ATTACK and product portfolio
We offer a wide selection of products that differ by type of fuel and power. All boilers are equipped with components from world manufacturers produced by the most modern technology, production controlled by camera and computer systems and tested by the most progressive devices and methods. In each group there is a wide range of choices both in modifications and in power. Boilers are mainly intended for heating of family houses, apartments and also larger businesses. The company profile includes a portfolio containing boilers for biomass, gas, electricity and accessories. In the production of boilers we use renewable energy source and that is photovoltaic panels with a power of 200kWp, which provide sufficient electrical energy for production.
Export and service
The company ATTACK exports its products to more than 51 countries around the world. Currently we export our products to all EU countries, Russia, USA, Canada and New Zealand. The biggest interest abroad is in modern wood gasifying and pellet and combined boilers, which are currently very popular in Europe and on the American continent as well as in stationary gas boilers, which reliably represent us even in distant Siberia.
A special approach to each customer, accommodating negotiations and reliability quickly grow into mutual trust, which ensures us a constant growth of customers in other countries.
Our service partners are trained in our own training center, which is equipped with products involved in real operation. Our partners are trained in two phases – theoretical and practical – where they have the opportunity to apply the theoretical part into practice and try everything on the products.The company ATTACK, s.r.o. covers the service network throughout the territory of Slovakia. In case of a breakdown, we can help you with up to 705 service organizations, whose professionally trained service technicians can quickly resolve any problem with an ATTACK product for heating of family houses, apartments or businesses.
Company profile – Research and development
The company ATTACK, s.r.o. has its own research and development center, where development and technical staff of the company annually innovate and prepare new heating technology devices. Emphasis is placed on the simplicity of device operation, modern design, environmental tolerance and minimal dimensions. All products are designed and developed in accordance with the relevant standards, specifications, legal and other regulations. The selection of components for ATTACK products is subject to the strictest criteria and only reliable and long-term operation verified components and materials from renowned suppliers can be used.
In development, ATTACK, s.r.o. does not cooperate with other manufacturers, but strives to always be one step ahead of the competition.
The company ATTACK – Certificates and awards
The company ATTACK, s.r.o. is the holder of the quality certificate ISO 9001:
- for the design and development of boilers,
- for the production of boilers,
- service of devices and boilers
We place high emphasis on the quality of our products. We are the holders of the quality management certificate ISO 9001 since 2003. This quality certificate of international directive certifies activities in research and development, production, design and operation of gas equipment. The approval certificate was approved and issued by the prestigious London-based auditing company Lloyd’s Register Quality Assurance.
The demanding requirements placed on the company are also evidenced by the need to defend the certificate from the certification company LRQA every 3 years.
This quality management system indicates the progressiveness and positive approach of the company ATTACK, s.r.o. to the customer, to whom it proves its quality of a purely Slovak traditional company. The management system also emphasizes the company's strategy, which leads to its compliance, further development and improvement. All ATTACK® products are high-quality premium products made using the most modern technology based on the latest research. The products have CE, TÜV, GOST certificates from renowned testing laboratories around the world.
We regularly participate in domestic and foreign exhibitions of heating technology, where the company has received a whole range of awards from honorable mentions to gold medals.