Vaillant hydraulic connection set boiler – cylinder VIH R 150, with safety group, temperature sensor and siphon

Product detailed description

Vaillant hydraulic connection set between the boiler and the VIH R 150 cylinder, with safety group, temperature sensor and siphon

This Vaillant hydraulic connection set is designed for the complete connection of the wall-mounted ecoTEC plus condensing boiler with the larger external VIH R 150 domestic hot water storage cylinder (150-litre volume). It is a set designed and tested by the manufacturer as a single unit, offering all the necessary parts precisely matched to each other – hydraulic piping, safety group, temperature sensor and siphon – instead of assembling them from separate individual components. This simplifies and speeds up installation for the installation company and at the same time eliminates the risk of an incorrect combination of parameters.

Why choose the 150-litre volume

The VIH R 150 cylinder with a volume of 150 litres is a suitable choice for households with a higher number of occupants (typically four or more people), for houses with two bathrooms, or where there is a common simultaneous need for hot water at multiple draw-off points at once. Compared to the smaller 120-litre cylinder, it provides a greater reserve of hot water for the morning or evening consumption peak, reducing the risk that the hot water supply will run out before the boiler manages to reheat it when several household members shower at the same time. This reserve is especially advantageous in households with irregular, burst-type consumption (for example a larger family with children, or a household that often has guests).

Contents of the set

The set includes hydraulic connecting piping between the boiler outlets and the corresponding connections of the VIH R 150 cylinder, a safety group matching the operating pressure of this specific cylinder, a cylinder water temperature sensor for communication with the boiler control, and a siphon for the safe and hygienic discharge of water from the safety valve, as well as condensate, into the sewage system. Due to the larger cylinder volume, the connecting piping and safety group themselves are also dimensioned with regard to this larger volume of water in the system.

Reheating control thanks to the temperature sensor

The temperature sensor fitted in the cylinder's immersion sleeve provides the boiler control with information about the current water temperature, based on which the boiler decides on starting and the intensity of reheating the cylinder. With the larger 150-litre cylinder volume, the correct function of this sensor is even more important for operating efficiency – with a larger volume of water, reheating takes longer, so it is important that the control has accurate and timely information about the temperature drop and can start reheating at the optimal time – neither too late (risk of insufficient hot water) nor unnecessarily often (unnecessary energy consumption).

Safety group adapted to the larger volume

The safety group included in this set protects the VIH R 150 cylinder against a dangerous increase in pressure during water heating. With a larger cylinder volume, this protection is even more important, since in the event of a fault there is a risk of a larger volume of hot water being released than with a smaller cylinder – which is precisely why it is essential that the discharge piping from the safety valve (handled in this set via the siphon) is sufficiently dimensioned and correctly routed to a safe discharge point.

Siphon and condensate discharge

The siphon in this set ensures the safe discharge of water from the safety valve as well as the acidic condensate from the condensing boiler into the sewage system, while its water seal prevents sewage odours from penetrating back into the installation area. Correct function of the siphon is a prerequisite for hygienic and trouble-free operation of the whole assembly, so its patency should be part of the regular inspection during service visits.

Installation

Installation of this connection set is part of the overall installation of the boiler + cylinder assembly and should take place simultaneously with the installation of the boiler and cylinder, exclusively by a qualified installer authorised to install gas and pressure equipment. It is important to correctly mechanically connect the piping, correctly fit the temperature sensor into the cylinder's immersion sleeve with good thermal contact, and correctly route the discharge via the siphon into the sewage system with sufficient gradient, taking into account the larger possible volume of discharged water with the larger cylinder.

Compatibility

This connection set is designed specifically for the combination of Vaillant ecoTEC plus boilers with the VIH R 150 cylinder – i.e. for the 150-litre volume. For a smaller cylinder (for example VIH R 120), the corresponding separate variant of the set must be chosen, as the connection dimensions and safety group sizing differ between the individual cylinder volumes. Before ordering, we recommend verifying the exact model of the cylinder and boiler in your installation.

Why choose the original connection set

The original Vaillant connection set guarantees that all components (piping, safety group, sensor, siphon) are designed and tested as a functional unit specifically for the combination of the boiler and the 150-litre cylinder. Alternatively assembling it from individually procured parts would carry the risk of an incorrect combination of parameters – for example an unsuitably dimensioned safety group with regard to the larger cylinder volume, or an incompatible type of temperature sensor.

Maintenance

As part of the regular annual service inspection, we recommend checking the functionality of the safety valve (using the test lever), the patency of the siphon and discharge, and the correct fitting of the temperature sensor. With a larger cylinder volume, it is advisable to pay increased attention to the overall condition of the cylinder's thermal insulation, since a larger volume of water also means a greater potential for heat loss during longer periods between individual draw-offs if the cylinder insulation is not in good condition.

Frequently Asked Questions

Wider context – planning hot water capacity for a larger household

When designing a suitable hot water cylinder capacity, it is advisable to base the decision not only on the number of household occupants, but also on the actual consumption pattern – i.e. whether there is simultaneous draw-off at multiple points (for example two bathrooms used at the same time), or whether consumption is spread gradually throughout the day. The 150-litre cylinder combined with the powerful ecoTEC plus condensing boiler represents a balanced choice for most larger family homes without the need to switch to a significantly larger (and more expensive, more space-demanding) stationary cylinder.

When ordering this connection set, we also recommend considering additional accessories depending on your space layout – for example an aesthetic insulating cover for concealed placement of the cylinder under the boiler, or additional soundproofing insulation when installing near living spaces. Our team will be happy to help you put together a complete solution tailored exactly to your project.

Space requirements of the larger cylinder

The 150-litre cylinder naturally has larger external dimensions than the smaller 120-litre variant, which needs to be taken into account already at the design stage of the utility room or space where the boiler + cylinder assembly is to be located. When installing under the boiler, sufficient clear height of the space must be allowed for; when installing next to the boiler, sufficient wall width is needed. This connection set is dimensioned precisely for the dimensions and connections of the VIH R 150 cylinder, so when using it there is no need to resolve any additional reductions or piping modifications beyond standard installation.

Effect of larger volume on reheating dynamics

With a larger cylinder volume, its complete reheating from a cooled-down state to operating temperature naturally takes longer than with a smaller cylinder, even if the same boiler were used. In normal operation, however, this is not a disadvantage – the boiler control keeps the cylinder continuously topped up to the set temperature, and complete cooling down only occurs exceptionally (for example after a longer absence with the heating switched off). This is precisely why the reliable function of the temperature sensor included in this set is important – it ensures that the boiler regularly, at optimal intervals, replenishes the energy consumed, instead of letting the cylinder cool down and then having to perform a significantly longer complete reheating.

Frequently Asked Questions – supplement

Choosing between 120 and 150 litres – summary of decision criteria

When deciding between the 120 and 150-litre volume, we recommend considering primarily the number of people in the household, the number of bathrooms, and the likelihood of simultaneous hot water draw-off at multiple points. As a rough guideline, households of up to three people with one bathroom will in most cases be well served by the smaller 120-litre volume, while households with four or more people, or with two fully used bathrooms, will appreciate the reserve provided by the 150-litre volume. The chosen cylinder volume should also be matched to the output of the boiler that reheats the cylinder – when combined with a more powerful boiler (for example the 25CS or 35CS range), reheating of the larger cylinder is faster than when combined with the smallest 10CS model.

If you are unsure about the right choice for your specific case, do not hesitate to contact our team – we will be happy to discuss the actual hot water consumption pattern in your household with you and recommend the optimal combination of boiler, cylinder and this connection set.

Summary of the benefits of the original solution

This connection set simplifies the realisation of the boiler + VIH R 150 cylinder assembly into a single comprehensive, manufacturer-verified package, saving the installation company time spent sourcing and verifying the compatibility of individual separate components. For the end customer, this means faster and more reliable project realisation, assurance of correctly functioning communication between the cylinder and the boiler control, and, not least, clear warranty responsibility in the event of any claim related to this part of the installation.

We recommend ordering this set together with the boiler and the VIH R 150 cylinder in a single delivery, so that the installation company has all the necessary parts available at once and can plan the complete installation in a single work session without unnecessary waiting for additionally purchased components. For larger projects involving a complete replacement of the heat source including modification of the distribution system, it is advisable to align the delivery of this set with the overall schedule of construction and installation works.

If you are replacing an older boiler + cylinder assembly with a new ecoTEC plus system with VIH R 150, we also recommend checking the condition of the original piping routing and possibly considering its partial modification, as older installations may not have included all the elements that this modern set addresses in one unit (for example a separate siphon for condensate discharge from the condensing boiler, which older non-condensing boilers did not need). Our technical advisors will be happy to help you assess whether this standard set fully covers your specific situation, or whether it is advisable to supplement it with additional components tailored to your project.

If you are planning a complete renovation of the utility room together with the replacement of the heat source, we also recommend taking into account, when designing the layout, the space needed for future access to the safety group (for regular testing), to the temperature sensor (for possible future replacement), and to the siphon (for checking patency). A well-designed utility room layout facilitates not only the initial installation but also all future service work throughout the entire service life of the assembly, which ultimately also results in lower costs and shorter time for each future service intervention.