The Ro-Bi TEC sanitary, heating and air-conditioning specialist makes perfect use of every ounce of energy.

Specialist craftsman Justin Albrecht from Ro-Bi TEC

TFG member Mr Robert Biesinger, Managing Director of Ro-Bi TEC Robert Biesinger from Rottenburg-Wendelsheim in Baden-Würtemberg, has the rendeMIX for the first time in 2018. He recognised early on the potential behind the rendeMIX assemblies. Robert Biesinger has a rMIX DN25 3×4+3mix R 35 by means of the supplementary product rMIX DN25 2×4 RT 5 by a third heating circuit. He has also added our bestseller, the RTB DN15 T0-40 balancing valve (Fbh) into the return of his underfloor heating circuit. We asked Mr Biesinger about the system and found out why he uses our products.



IFH Nuremberg from 26-29 April 2022

At this year's IFH in Nuremberg, we will again be showing solutions on the subject of "Efficient hydraulics in heating systems".

For years, low return temperatures and excellent stratification in the buffer tank have been part of the rendeMIX trademark. (more…)


How David Kaiser with Baunach reduces system consumption between 30 and 50% on average:

Journeyman Drin Tahiri (l.) and foreman Jörg Sautter (r.) installed the system.

Baunach Fachpartner, Mr David Kaiser, Managing Director of the Kaiser Nachhaltig heizen GmbH from Gerstetten in Baden-Würtemberg, has the rendeMIX I first got to know it in 2018. Various facilities followed in the following years until today. In 2021, the Netto Markt (brand discount) facility in Hermaringen was implemented, which we would like to introduce to you in this article. David Kaiser uses a rMIX DN25 3×4 R 5 in combination with a rMIX DN25 2×4 RH 35. He is also an advocate of thermostatic balancing and has therefore equipped all air heater heating circuits with a RTB DN20 T20-70 adjustment set (nimble) equipped. Mr Kaiser regulates his heat generator using a VTB DN32s T40-100 Condensing set. Heat recovery is achieved via a VTB DN32s T25-70 Condenser Set realised. We asked Mr Kaiser about the plant and learned why he chose the rendeMIX and thermostatic balancing.



Now also on social media!

We can now also be reached on popular social media platforms such as Facebook, Instagram, Twitter and WhatsApp. There you can take a look behind the scenes of Baunach and its product manufacturing.





New return temperature limiter "RTB T0-50 balancing valve (slow)" with integrated temperature sensor

Recently we have started to offer for our innovative Baunach products new return temperature limiter with a temperature range of 0-50 °C and integrated temperature sensor on. For you, this means that you no longer have to invest time in installing a temperature sensor. You also save money, as no additional components such as T-pieces or immersion sensors are required.

The RTB valve is ideally suited for single-pipe heating systems, ceiling radiators, swimming pool heat exchangers or a radiator and underfloor heating system. Due to the inertia, the valve is not Suitable for air heaters and ventilation and air-conditioning systems.

Benefit from our innovative & efficient solutions today!



Reference system Manghofer Gas-Sanitär-Heizung GmbH

Baunach Fachpartner, Mr Konrad Manghofer, Managing Director of the Manghofer Gas-Sanitary-Heating GmbH from Ampfing in Bavaria, has the rendeMIX I first became acquainted with it in 2004. Various installations followed in the years that followed until today. In 2010, we implemented our own system, which we would like to present to you today. So 11 years of continuous operation with a rendeMIX 3×4 Buffer discharge with downstream rendeMIX 2×4+ for a third, mixed circle, which we would also like to present to you in this article. We were able to ask Mr. Manghofer about the plant and learn why he chose the rendeMIX employs.



Reference plant Schuster and Son BV "Seehotel

Baunach's specialist partner, Mr Michael Schreiner, master craftsman at Schuster und Sohn KG in Kaiserslautern, has implemented the rendeMIX heat distribution system with a 3-chamber distribution system. We were able to ask Mr. Schreiner about the system and learn why he uses the rendeMIX every time: (more…)


rendeMIX Update - new ball valves for all light versions DN25

In the past, many customers have asked us about our ball valves in the DN25 version. These are indeed functional - but would not fit our high-quality assembly. In addition, there would be a high risk of using a slotted screwdriver instead of an internal hexagon. This could damage the component.

As part of the continuous improvement of our products, we have replaced the previous ball valve with a higher quality one with an aluminium butterfly handle.



Why Andreas Graupner is convinced of rendeMIX

Baunach specialist partner, Mr Andreas Graupner, Managing Director of Graupner Bäder-Heizungen-Solar GmbH in Schwarzenberg, has implemented the rendeMIX heat distribution system on a buffer storage tank. We were able to ask Mr Graupner about the system and find out why he uses the rendeMIX every time:



Why Jörg de Jong would recommend rendeMIX to every skilled craftsman

Baunach specialist partner, Mr Jörg de Jong, Managing Director of SEDEJO GmbH in Frechen, has implemented the rendeMIX heat distribution system with a condensing boiler cascade. We were able to ask Mr. de Jong about the system and find out why he uses rendeMIX every time:



New - Return flow utilisation on hot water tanks!

Have you ever asked yourself why you can't use the hot return of hot water tanks to supply a heating circuit with it? The whole thing would save you a lot of energy if there were a way.

We would now like to present this possibility to you!



Welcome to the FÖRDERBAR

Almost all Baunach products are now eligible for BAFA funding of 15% (plus 5% iSFP bonus).

Promotion for all:

Look out for this symbol on our products:



20% BAFA subsidy on hydraulic balancing in no time at all

As of now, our return temperature limiter valve for underfloor heating circuits is eligible for funding from BAFA as part of hydraulic balancing.

KfW/BAFA sample funding form

About the product

The RTB valve is a thermostatic return temperature limiter with adjustable maximum temperature and fixed minimum flow in the order of 0.5% of the nominal flow. (more…)


20% BAFA subsidy for rendeMIX with high-efficiency pump

As of now, our classic 2-circuit return utilisation assemblies with built-in pump are on BAFA's list of eligible pumps.

"The subsidy amounts to 30 % of the net investment costs for services related to both the replacement of heating circulation pumps and hot water circulation pumps with high-efficiency pumps and related to hydraulic balancing, up to a maximum of 25,000 euros per location." (Source:

Through this funding programme, our "a" Assemblies with integrated high-efficiency pump even cheaper than Without pump. This way, your customers end up saving even more on their investment and also receive a new pump. (more…)


Double Eurocone screw connection for RTB

Quick and easy installation of the return temperature limiter!

Dear Ladies and Gentlemen,

We would like to draw your attention to a practical innovation in our range that can save you and your fitters a lot of time and therefore money.

With the new DKV 150 double cone fitting let our RTB 150 0-40 Adjustment Sets The RTB 150 0-40 can be mounted easily, quickly and cleanly directly on the return collector of the floor manifold. From now on, order a DKV 150 double cone fitting with every RTB 150 0-40 adjustment set!

Item details:
- Double-sided conical screw connection with union nuts G¾ (i) for Euro cone
- DN15, straight through, brass
- PN 10bar, Tmax 120°C
- Length: 30mm, hexagon nut: spanner size 30



rendeMIX 3×4+ sys

 2-circuit compact solution for system separation at the buffer

Those of you who have ever had the pleasure of a rendeMIX 3×4+ on a buffer storage tank know what we are talking about: from doubling to tripling the usable buffer volume. The fact that such results can really be achieved with the methods used here - return utilisation and two-zone discharge - has already been reported several times in the trade press, for example in Sanitär+Heizungstechnik 3/2017:

Hydraulics made visible

In order to make this possible also on systems with system separation, we are now pleased to offer you the rMIX 3×4+ sys present. This has been precisely matched to the operation of a system separation in the low-temperature circuit by means of flow control. This means that nothing stands in the way of efficient storage utilisation!

Application example: Buffer with peak-load boiler

Application example buffer with peak load boiler

End customer brochure Storage - The two-zone principle



A good feeling is half the battle

What is the quality of a control loop?

Sensor on CHP

A controller constantly compares a specified SET value with a measured ACTUAL value and determines a reaction (manipulated variable) from the difference (deviation) with the aim of making the deviation between the SET and ACTUAL values as small as possible. If, for example, a constant return temperature of 60°C is required for a CHP unit, this is the SET value, while the ACTUAL value is determined by a temperature sensor. A possible reaction would be a three-point signal that opens, stops or closes a mixing valve via an electric drive so that the return temperature is raised, maintained or lowered.



Why do you actually need both?
Two-zone loading and two-zone unloading?

Which by now word has got around ...

States of charge in the buffer storage tank

States of charge in the buffer storage tank

is that the best possible stratification is the be-all and end-all of the efficient use of buffer storage tanks. Because only the best possible stratified storage tank can still absorb heat when it is already relatively full and release heat when it is already relatively empty. The secret of this benefit lies in the fact that with good stratification the storage tank is always hot at the top and always cold at the bottom (Fig., buffers 2-4), while the thoroughly mixed storage tank is warm from top to bottom (Fig., buffer 1). The border between hot and cold should be as abrupt as possible. The fuller the storage tank, the lower (picture, buffer 3), the emptier it is, the higher (picture, buffer 4) this limit is. In any case, a well stratified storage tank should not contain any hot water at all. (more…)


Parallel or one behind the other?

What to do with several buffer storage tanks?

Systems are increasingly being equipped with buffer storage tanks, whether for heat pumps, wood boilers, CHP units or solar systems. It is not uncommon for the necessary storage volume to have to be divided among several smaller tanks because only these fit through the doors or stairwells. This raises the question of whether a parallel or back-to-back connection of buffer storage tanks is the better solution. As usually in life, the appropriate answer is: "It all depends."



Buffer connection on one side

A simple way to improve stratification in the buffer

Two-sided buffer connection

Two-sided buffer connection

It is very common to see in hydraulic plans and installations that heat generators and heat consumers are connected to buffer tanks in separate connections for each height (top, bottom, possibly also centrally). However, this often has a negative effect on the flow and thus on the stratification of the buffer tank, as the following example illustrates. Let's assume that a 28kW log boiler (90°C flow temperature) loads a buffer storage tank, while at the same time a radiator circuit (70/50°C) and a floor circuit (40/30°C) are supplied with a total of 14kW. Let us further assume that the two heating circuits are connected to the buffer by rendeMIX return utilisation with 70/30°C in total. When the buffer is connected on both sides, the entire boiler volume flow flows into the buffer at the top left and is removed again at the bottom left. In addition, the entire system volume flow is taken out at the top right and fed back in at the bottom right. The following formula therefore applies: (more…)


Pump speed and flow temperature

More efficiency at the buffer tank with less effort

Some regenerative heat generators, such as wood or pellet boilers or CHP units, may only be operated with a fixed return temperature. For this purpose, a return flow increase (RLA) is used, which feeds parts of the heat generator flow into its return flow. Very often, the pump speed is selected unnecessarily high, which reduces the efficiency of the buffer storage loading. (more…)


Drinking water reservoir? If already - then already!

The new rTANK

The new rTANK

Until a few years ago, drinking water storage tanks were considered the solution par excellence for heating drinking water, and they are still widely used in the private sector today. And who is surprised? After all, they offer a comparatively high level of comfort with little technical effort and are available at a reasonable price.

With the advent of solar systems, however, it became necessary to reduce the return temperatures to the heating system as low as possible. And at about the same time, the legionella issue arose. Both spoke in favour of instantaneous water heater systems, the hygiene storage tank with corrugated tube heat exchanger and the fresh water station. But is this additional expense really always justified and aren't there other disadvantages? (more…)


Thermostatic balancing with RTB valves

The purpose of hydraulic balancing

is to provide the right amount of water to each consumer in a distribution network. This must not be too small, because otherwise the consumer will not be sufficiently supplied with heat. But it must also not be too large, because otherwise its return temperature will rise too much, the supply to other consumers will be impaired and the network efficiency will drop. But what is the "right" amount of water? (more…)


Exhaust gas condenser, return flow boost and buffer efficiency

Flue gas condensers continue the eco-trend towards condensing boiler technology

The idea of extracting additional heat from the combustion exhaust gas by condensing the water vapour it contains has now become widely accepted under the term condensing technology for natural gas and fuel oil boilers. In this respect, it can be assumed that the trend towards condensing technology will also continue for wood boilers and CHP units, especially since there are further advantages to be recorded for each of these technologies: (more…)