Product detailed description

ATTACK PZO 80 PLUS - directly heated gas domestic hot water storage tank

The PZO 80 PLUS storage tank belongs to a completely different category of products than the Z-series storage tanks (OKC, SOL, HP) described elsewhere in our offer. While the Z-series tanks are indirectly heated and necessarily need an external heat source (boiler, heat pump), the PZO 80 PLUS model has its own gas burner built directly into the lower part of the tank and is therefore a fully standalone (autonomous) source of hot water.

Key difference: direct vs. indirect heating

In an indirectly heated storage tank (e.g. ATTACK Z 200 OKC), the water is heated by heat supplied from an external boiler via an internal heat exchanger - without a working boiler, such a tank would not heat water at all. In contrast, the PZO 80 PLUS has its own combustion chamber with a gas burner located directly under the tank, the flue gases are led through a heat exchanger inside the tank and then discharged through a flue outlet outside the building (or into a chimney, depending on the design - atmospheric or turbo with forced draught). This design is essentially similar to a stationary gas boiler, just optimised exclusively for hot water preparation, not for space heating.

Thanks to this, you can install the PZO 80 PLUS anywhere there is a natural gas supply (or a connection to propane-butane, depending on the burner design) and a flue gas outlet, completely independently of whether the building has a central heating system or not. This is a typical solution for cottages and cabins heated for example by a fireplace or electricity, where it makes no sense to build a gas central heating system just to heat water, but also for businesses, workshops, simpler apartments or as a supplementary source of domestic hot water outside the main season.

Key features

• Volume of 80 litres, fully standalone (autonomous) source of domestic hot water
• Own gas burner with built-in ignition and flame failure protection
• Does not require connection to a boiler or other external heat source
• Enamelled steel tank with magnesium anode
• Hard PU insulation with low heat losses
• Built-in thermostat with hot water temperature setting
• Safety protection against flame extinction and gas leaks
• Suitable for cottages, cabins, workshops and apartments without central heating

Technical parameters

Installation

The PZO 80 PLUS storage tank must be installed exclusively by an authorised person with professional competence for installation and inspection of gas appliances. Installation includes: connection to the gas supply with its own shut-off valve, construction of the flue gas exhaust (chimney or facade duct depending on the design type - atmospheric/turbo), connection to the cold and hot water supply with a safety valve (max. 0.6 MPa) and, if necessary, a domestic hot water expansion tank. Before commissioning, an inspection of the gas appliance and flue gas path is required in accordance with applicable legislation.

We also recommend ensuring sufficient ventilation of the space where the tank is located, depending on the type of appliance (open/closed appliance), and installing a gas leak detector as additional safety protection, especially in enclosed or less ventilated spaces of cottages and cabins.

Maintenance and service life

In addition to an annual check of the magnesium anode, a gas appliance requires regular servicing of the burner, ignition and safety automatics, as well as checking the patency and tightness of the flue gas path - we recommend this be carried out at least once a year by an authorised service technician. Neglecting the servicing of the gas appliance can lead not only to malfunction but also to a safety risk.

Commissioning procedure step by step

1. Placement of the tank in the designated location with sufficient ventilation depending on the type of appliance
2. Connection to the gas supply with its own shut-off valve (exclusively by an authorised person)
3. Construction and connection of the flue gas exhaust (chimney or facade duct depending on the design)
4. Connection of the cold and hot water supply with a domestic hot water safety valve (max. 0.6 MPa)
5. Filling the tank with water and venting it
6. Leak test of the gas connection and flue gas path
7. First ignition of the burner and setting the required hot water temperature on the thermostat
8. Inspection of the gas appliance and flue gas path by an authorised person
9. Handover of documentation (inspection report, manual, warranty certificate) to the user

Safety warnings

As a gas appliance, the tank requires increased safety attention: regular inspection of the gas appliance and flue gas path, functional flame failure and gas leak protection, sufficient ventilation of the installation space and free access to the gas shut-off valve. We recommend adding a separate gas leak detector, especially in enclosed or less ventilated spaces (cottages, basements). Any interventions in the gas section may only be carried out by a person with the appropriate authorisation.

Operating economics

Since the PZO 80 PLUS uses gas directly for heating without an intermediary boiler and without losses due to a potentially long heating circuit route, it is an energy-efficient way of preparing domestic hot water where building a separate central heating system does not make sense. Compared to electric heating of the same volume of water, gas heating is usually cheaper at current energy prices, especially with regular and higher hot water consumption (a cottage with multiple users, a business).

Who the PZO 80 PLUS is suitable for

This model is ideal for cottages and cabins without central heating, workshops, garages, businesses or smaller apartments, where you don't want or don't need a separate heating boiler just to prepare hot water. The 80-litre volume is sufficient for showering and regular consumption by 1-2 people. If, on the other hand, you are also planning gas central heating, it is more economical to choose a boiler with an indirectly heated Z-series storage tank from our offer.

How to navigate the ATTACK Z / PZO storage tank range

The ATTACK brand offers several types of hot water storage tanks, which differ in the method of heating and intended use. Below is a brief overview to help you find your way around when choosing a related or replacement product:

• Z .. OKC / OKCV - Basic indirectly heated storage tank with one heat exchanger, connected to a boiler. The simplest and most affordable solution for domestic hot water preparation 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 - boiler and large-area solar. A choice for households with solar collectors who want to make use of free solar heat as well.
• Z .. HP - One large-area heat exchanger optimised for low outlet temperatures of a heat pump. A choice for households with a heat pump as the main heat source.
• PZO .. PLUS ▸ this is exactly the product you are viewing - Directly heated, own gas burner, no boiler needed. A choice for cottages, workshops and businesses 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 (outputs 2/2.5/4.5/6 kW) via a 6/4" flange, which is available in our offer as a separate product.

Typical mistakes in selection and installation

The most common mistake is confusing this model with an indirectly heated Z-series storage tank and then waiting in vain for it to heat up without a gas connection and flue gas exhaust - the PZO 80 PLUS requires a functional gas connection, it does not need an external boiler, but it will not heat water on its own without gas either. Other common mistakes are underestimating the requirements for room ventilation, missing or delayed inspection of the gas appliance, and neglected checking of the magnesium anode. Before ordering, always check whether a gas connection is available at the installation site and whether it is possible to build a flue gas exhaust corresponding to the design (atmospheric/turbo).

Frequently asked questions

Do I also need a boiler for this storage tank?

No, quite the opposite - the main advantage of this model is that it has its own gas burner and works completely independently without any boiler or other heat source.

What is the difference compared to the Z-series storage tanks (OKC, SOL, HP)?

The Z-series tanks are indirectly heated and must be connected to an external boiler or heat pump. The PZO has its own gas burner and is a fully standalone, independent source of domestic hot water.

Can I connect the storage tank to propane-butane instead of natural gas?

Yes, there are burner designs for both natural gas and propane-butane; when ordering, it is necessary to specify the fuel type according to your connection.

Do I need a chimney?

Yes, the flue gases must be discharged either through a chimney (atmospheric design) or through a facade duct with forced draught (turbo design) - the specific method depends on the design of the tank and the layout of the building.

Who can install the storage tank?

Installation and connection to the gas supply and flue gas path must be carried out exclusively by a person with professional competence for the installation of gas appliances, with a subsequent inspection before commissioning.

What is the maximum water temperature the storage tank can reach?

Typically 60-65 °C, the exact value depends on the setting of the built-in thermostat and the burner output.

Is operation safe in enclosed spaces of cottages?

Yes, with correct installation, functional flame failure and gas leak protection, and compliance with ventilation requirements. We also recommend adding a gas leak detector as additional protection.

How often does the gas burner need to be serviced?

The recommended service inspection is at least once a year by an authorised technician, and should also include checking the flue gas path and the safety automatics.

Is operation cheaper than an electric storage water heater?

At current energy prices, gas heating is usually cheaper than electric heating, especially with higher and regular hot water consumption; the exact comparison depends on current gas and electricity prices in the given location.

Can I use the storage tank as a supplement to an existing electric boiler?

Yes, the PZO can work in parallel with another source of domestic hot water, for example as the main source with an electric boiler in a backup role, or vice versa, depending on the layout of the plumbing in the building.

Do I need an inspection even for the first installation?

Yes, before first commissioning, an inspection of the gas appliance and flue gas path is a legal obligation, carried out by an authorised inspector.

Can central heating be added later and the storage tank connected to it?

This model is designed as a standalone water heater and does not have a built-in heat exchanger for connection to a heating circuit; when building central heating, it is more suitable to add a separate indirectly heated Z-series storage tank and keep the gas PZO as a backup source of domestic hot water.

What is the difference between the PZO80PLUS and PZO120PLUS besides volume?

Both models have the same principle of direct gas heating, they differ in tank volume (80 l vs. 120 l) and therefore also in dimensions and weight; the burner output is adapted to the volume so that an adequate heating time is maintained.

Ignition and burner safety automatics

The gas burner of the PZO 80 PLUS storage tank is equipped with automatic ignition (piezoelectric or electronic, depending on the specific design) and flame failure protection, which immediately shuts off the gas supply to the burner if the flame accidentally goes out - thus preventing uncontrolled gas leakage into the space. The safety equipment also includes a thermostat limiting the maximum water temperature and a domestic hot water safety valve. This combination of safety features is standard for all gas appliances sold on the European market and is regularly verified during mandatory inspections.

Comparison of PZO80PLUS and PZO120PLUS volumes

We offer the PZO PLUS range in volumes of 80 and 120 litres. The smaller 80 l volume is sufficient for showering and regular consumption by 1-2 people, for example in a smaller cottage or workshop. The 120 l volume is recommended for 2-4 people with regular consumption including a bathroom, or where simultaneous consumption from multiple points is expected. Since this is a directly heated storage tank with its own burner, a larger volume also means a somewhat longer initial heating time after switching off, but a greater supply of hot water immediately available.

Summary

ATTACK PZO 80 PLUS is a practical solution where you need to quickly and reliably solve hot water without building central heating - all you need is a gas connection, flue gas exhaust and water supply. Ideal for cottages, workshops and smaller businesses, where investing in a boiler does not make economic sense. Thanks to its simplicity of operation and independence from any other heating system, it represents a reliable and proven choice for many years.

Warranty and service

The manufacturer ATTACK provides a 5-year warranty on the storage tank from the date of sale, subject to 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 contact the nearest service centre if needed.