Thermostatic mixing valve set for uniTOWER Split plus

Product detailed description

Admission set with thermostatic mixing valve for the uniTOWER Split plus module – an extended version of the admission set with temperature regulation of the make-up water.

The Vaillant uniTOWER system (in the plus and Split plus versions) is a compact hydraulic module in the form of a tower with a footprint comparable to a standard refrigerator, which combines in one cabinet a hot water tank with a volume of 190 l, a complete heating hydraulic system, a backup electric heater, and a control unit. The module is connected in the aroTHERM / aroTHERM plus / aroTHERM Split system to the external (or internal, in the Split version) unit of the air-to-water heat pump and is responsible for the distribution of heat to the heating circuit and the preparation of hot water. Precisely because most of the components are integrated directly in the tower body, Vaillant offers a range of supplementary, connecting, and service parts for the module that allow the hydraulics to be adapted to a specific installation – ceiling height, connection side, the need for hot water circulation, or additional hydraulic separation of circuits.

Heat pump aroTHERM and the location of the part in the system

Heat pumps of the aroTHERM / aroTHERM plus / aroTHERM Split range extract heat from the air even at low outdoor temperatures and transfer it to the heating circuit and the hot water tank via the uniTOWER module. Since compared to a gas boiler, lower temperatures of the heating water are used and there is a greater emphasis on the correct hydraulic balancing of the entire circuit, the quality and compatibility of each individual hydraulic component – including expansion vessels, circulation and connecting sets – are directly linked to the overall efficiency and quiet operation of the system. The use of non-original or incorrectly dimensioned components can negatively affect both the hydraulic balance and the declared performance coefficient (COP) of the system.

Composition of the delivery and packaging

The part is delivered in the original Vaillant packaging, which protects the connecting threads and sealing surfaces from damage during transport. The delivery always includes the necessary installation documentation (installation instructions) in a language supported by the manufacturer, based on which the service technician will verify the correct sequence of installation steps, tightening torques of the connections, and the method of testing the tightness after connection.

Lifespan, service, and preventive maintenance

The hydraulic components of the uniTOWER module are designed for long-term maintenance-free operation. Nevertheless, we recommend that during the regular annual service inspection of the heat pump, this part should also be checked – especially the tightness of the connections, any signs of corrosion or media leakage, and the functionality of the associated valves. Timely preventive inspection prolongs the life of the entire system and reduces the risk of unplanned heating or hot water preparation outages, especially during the winter period.

What the set is used for

This set performs the same basic function as the standard admission set (code 0010038388) – that is, the safe addition of water to a closed heating circuit in the event of a pressure drop – but is additionally equipped with a thermostatic mixing valve. This adjusts the temperature of the make-up water by mixing cold water from the supply with warmer water from the system so that thermal shock does not occur in sensitive components (e.g., aluminum heat exchangers or plastic floor heating pipes) when cold water is added directly from the mains.

Technical parameters

• Type: admission set with an integrated thermostatic mixing valve
• Application: uniTOWER Split plus module
• Regulates the temperature of the water supplied to the heating circuit during make-up
• Mountable in the module housing, including connecting and sealing elements
• Protects sensitive system components (heat exchangers, plastic floor heating pipes) from thermal shock

When to choose this version instead of the basic one

• In systems with floor heating, where the piping is more sensitive to sudden temperature changes
• In systems with aluminum components (e.g., some types of heat pump heat exchangers), where the manufacturer recommends regulated temperature of the make-up water
• If the investor requires a higher level of system protection and is willing to accept a higher purchase price compared to the basic set

Installation and assembly

The part is intended for installation in the housing of the uniTOWER module and its installation must be carried out only by a trained service technician authorized by Vaillant. An incorrectly installed or improperly assembled hydraulic circuit can cause leaks, reduced system efficiency, or void the warranty on the entire device. Therefore, before ordering, we recommend having the project documentation available or at least a photo of the actual installation condition and the exact type of the uniTOWER module marked (including the performance range and plus/Split plus version), because individual connecting sets differ in side configuration and sealing type.

Related accessories for the uniTOWER module

• Expansion vessel 8 l for hot water (TÚV) (code 0020170500)
• Set with circulation pump TV (code 0020170503)
• Set with circulation pump TV for Split plus (code 0010038384)
• Circulation connecting set without pump (code 0010042664)
• Admission set (code 0010038388)
• Non-insulated connecting set (low ceilings, right) (code 0010039993)
• Insulated connecting set (low ceilings, right) (code 8000012566)
• Insulated connecting set (low ceilings, left) (code 8000012577)
• Insulation covers for connecting valves (2 pcs) (code 0010042662)
• Connecting adapter 1" / 28 mm – nut (2 pcs) (code 0010038385)
• Hydraulic separation module for uniTOWER /7 (code 0010039991)
• Expansion vessel 2 l for separation module /7 (code 0010040112)
• Internal unit connection Presfitting (code 0010027979)
• Connecting adapter 1" / 28 mm – external thread (2 pcs) (code 0010039178)

Frequently asked questions

Is this set mandatory, or is the basic admission set sufficient?
In most standard installations, the basic set is sufficient; the thermostatic version is recommended mainly for more sensitive systems or on the explicit recommendation of a designer or service technician.

Can a specific mixing temperature be set?
The thermostatic valve is set to a value suitable for safe system make-up; precise setting and any adjustments are performed by the service technician during installation.

Does this set require more space in the module housing?
The set is designed to fit into the same mounting space as the basic admission set.

Why order this part from atria.sk

We are a specialized online store focused on heating technology, heat pumps, and related accessories, including less common service and supplementary parts that are not available in standard hobby stores. By ordering from us, you are assured that it is an original Vaillant part delivered through an authorized distributor, not an unverified replacement from an unknown source. For larger orders of related accessories (e.g., a complete connecting set together with an expansion vessel and admission set), we are happy to prepare a joint offer and recommendation based on the type of your specific uniTOWER module.

Our sales representatives are in regular contact with service technicians and installation companies that actually implement uniTOWER modules and aroTHERM heat pumps in the field – thanks to this, we can choose the correct part not only based on catalog data but also on practical experience with specific types of connections. If you are unsure which exact variant of the part (e.g., connection side, insulated or non-insulated version) your system requires, do not hesitate to contact us before placing your order – this will help you avoid possible exchanges or returns of goods.

Warranty, supplier and support

On this original part of the brand Vaillant we provide a 2-year warranty. The product is supplied by the Vaillant authorized partner for the Slovak market, the company WINTNER s.r.o., which ensures the authenticity of the part and its full compatibility with other components of the uniTOWER system. When placing an order, we recommend to specify the exact designation and side configuration of the installed uniTOWER module (type, performance range, version plus / Split plus), so that we can verify 100% match of the part before shipment. In case of uncertainties when selecting the correct part or when planning the installation, we are happy to advise you by phone and by e-mail – contact our sales department before ordering, if you are not sure about the compatibility with your specific model.