Condensing boiler · New equipmentSaunier Duval Thema MiConnect 26-CS/1-C
Saunier Duval Thema MiConnect 26-CS/1-C boiler
Heating and hot water for everyday use, combined in a gas boiler.
- Gas
- Natural gas Convertible to propane
- Wi-Fi
- Optional MiGo Link
- Heating
- 2.9-20.0 kW 80/60 °C
- Domestic hot water flow rate
- 12.2 l/min ΔT 30 K
Gas and Wi-Fi: compatibility and accessories
Gas and conversion: It accepts natural gas G20 and conversion to propane G31 through the manufacturer's adjustment procedure. Compatibility with butane G30 is not offered without explicit documentation for this version. The conversion and commissioning are the responsibility of a qualified professional; they are not included in the purchase. Source 1 ↗ Source 2 ↗ Source 3 ↗
Wi-Fi and supply: Optional MiGo Link solution for control from the app. It is purchased separately; the wired or radio controls of the set do not imply that the connection module is included. Source 1 ↗ Source 2 ↗ Source 3 ↗
Description
Saunier Duval combines home heating and hot water for taps and showers. When choosing it, both water usage and heating needs are important: a home with multiple showers running at the same time requires a different assessment.
Domestic hot water is prepared when you turn on the tap, without an integrated storage tank. It is important to check how many water points you will use at the same time and the available space to replace the boiler.
What to check before installing this boiler
The choice of equipment does not replace the inspection of the installation by a qualified professional.
- Confirm the model and commercial reference, the type of gas, and the supply configuration in the manufacturer's documentation.
- Ask a qualified installer to assess the heating and domestic hot water demand; compare measured flow rates at the same temperature difference.
- Check dimensions, connections, flue gas evacuation, condensate drainage, and controls compatible with the existing installation.
- Confirm the included accessories and the delivery time before scheduling the installation. The online purchase of the equipment does not include installation or commissioning.
Technical data of Saunier Duval Thema MiConnect 26-CS/1-C
- Brand
- Saunier Duval
- Model
- Saunier Duval Thema MiConnect 26-CS/1-C boiler
- Status
- New
- Supply scope
- With MiSet wired. Installation not included.
- Shipping
- Included in mainland Spain. Please confirm the deadline.
- Commercial reference
- 125125140
Specifications and dimensions of the model
Compare each magnitude under its testing conditions: heating, domestic hot water, efficiency, and dimensions.
- Useful heating output (80/60 °C, G20)
- 2.9-20.0 kW
Heating - Useful heating output (50/30 °C, G20)
- 3.3-21.7 kW
Heating - Useful heating power with propane (80/60 °C, G31)
- 5.1-19.9 kW
Heating - Useful heating power with propane (50/30 °C, G31)
- 5.5-21.2 kW
Heating - Heating temperature adjustment
- 15-80 °C
Heating - Maximum heating pressure
- 3 bar
Heating - Heating expansion vessel
- 8 l; it is not a domestic hot water storage.
Heating - Nominal power of domestic hot water (G20)
- 25.7 kW
Hot water - Specific flow rate DHW D (ΔT 30 K, EN 13203-1)
- 12.2 l/min
Hot water - Minimum flow rate of domestic hot water
- 1.5 l/min
Hot water - Domestic hot water flow limiter
- 8 l/min
Hot water - Permissible service pressure of domestic hot water
- 0.3-10 bar
Hot water - Required connection pressure for domestic hot water
- 0.7 bar
Hot water - Adjustment of domestic hot water temperature
- 35-60 °C
Hot water - Preparation of domestic hot water
- AquaFast Warm Start and SmartShower
Hot water - Primary heat exchanger
- Stainless steel
Construction - Control of the offered reference
- MiSet wiring
Regulation - Connection with application
- Optional MiGo Link for this MiSet set
Regulation - Dimensions (height x width x depth)
- 740 x 418 x 344 mm
Dimensions and installation - Weight without packaging or water
- 29.6 kg
Dimensions and installation - Minimum lateral distance
- 50 mm per side
Dimensions and installation - Minimum lower distance
- 160 mm
Dimensions and installation - Front access space
- 500 mm
Dimensions and installation - Upper space with duct 60/100
- 165 or 248 mm, according to the installation plan
Dimensions and installation - Heating energy class of the appliance
- A
Efficiency and sound - Energy class of domestic hot water
- A
Efficiency and sound - Sanitary profile
- XL
Efficiency and sound - Acoustic power
- 47 dB
Efficiency and sound - Seasonal ErP efficiency
- 94 %
Efficiency and sound - Electrical supply
- 230 V, 50 Hz
Electricity - Maximum electrical consumption in heating
- 75 W
Electricity - Maximum electrical consumption in domestic hot water
- 88 W
Electricity - Maximum power consumption
- 120 W
Electricity - Standby power consumption
- 2 W
Electricity - Degree of protection
- IPX5D
Electricity
PDF and documentation of the model
Original documents, unmodified. Refer to the installation plan and the conditions of each data point before selecting the equipment.
- Technical data and installation manual Thema MiConnectPDF · 92 pages · Saunier DuvalView original on the manufacturer's website ↗
- Technical sheet: Thema MiConnect with MiSetPDF · 2 pages · Saunier DuvalView original on the manufacturer's website ↗
- Energy label Thema Condens 26-CS/1PDF · 1 page · Saunier DuvalView original on the manufacturer's website ↗
The gallery sheets are summaries of Uniclima based on these documents. The external volume diagram does not represent connections, accessories, or service distances.
Frequently asked questions: condensing boilers 125125140
Does the Thema MiConnect 26 work for a 90 m² apartment with radiators?
With a presumed thermal loss of 80 W/m², a 90 m² floor would require 7.2 kW. This demand falls within the range of 2.9-20.0 kW at 80/60 °C with natural gas; it does not mean that 90 m² is a surface guaranteed by the manufacturer. An area that only demands 2 kW is below the minimum and may cause frequent starts and stops. The installer must calculate the actual losses and check radiators, temperatures, and usage by zones; the 26 in the name does not represent 26 kW of heating.
Can I use two showers at the same time with the Thema MiConnect 26?
Two showers of 8 l/min add up to 16 l/min. The boiler specifies a flow rate of 12.2 l/min at ΔT 30 K, which is below that demand, and a sanitary limiter of 8 l/min. The test flow rate and the limiter are not the same: the 12.2 l/min should not be used as a promise of available flow in all taps. For simultaneous use, it is advisable to consider another solution depending on the temperature of the cold water, mixers, and pressure. AquaFast improves preparation but does not provide a reserve to maintain two showers.
Does AquaFast Warm Start mean that it has a hot water tank?
It is not a backup domestic hot water accumulator. AquaFast Warm Start prepares the production of DHW to reduce waiting time, and SmartShower maintains the sanitary mode during brief interruptions of a shower. These functions do not add stored liters or eliminate the cold water that may remain in a long pipe. The 8-liter tank belongs to the heating circuit and does not supply water to the shower. This Thema should not be confused with the IsoTwin or IsoMax accumulation families.
What space does the Thema 26 need inside a cabinet?
The body measures 740 x 418 x 344 mm and weighs 29.6 kg without water or packaging. It is necessary to reserve 50 mm on each side, 160 mm below, and 500 mm for front access. Above, the installation with duct 60/100 requires 165 or 248 mm depending on the plan; other diameters have different distances. A space exactly the same as the body is not sufficient. The installer must check the flue gas outlet, the connections, the support, and ensure that access for maintenance remains available.
Does reference 125125140 come with a wireless thermostat and mobile control?
This reference corresponds to the set with wired MiSet, not to MiSet Radio. The family allows connection with the application via MiGo Link, but that module is optional in this set and is not included just by the name MiConnect. Before replacing a thermostat, its connection and existing configuration must be checked. The class A of the device does not automatically become A+ just because it has an application.
Does it maintain the same minimum power when operating with propane?
At 80/60 °C, the Thema 26 declares 2.9-20.0 kW with natural gas G20 and 5.1-19.9 kW with propane G31. A low-demand area may be better suited to the minimum of G20 than to that of G31. The admission of propane requires checking the authorized version and commissioning by a qualified professional; it is not an adjustment that the buyer should make. The values in kW are thermal: the maximum published electrical consumption is 120 W, which is a different magnitude.
Does the price include installation and shipping?
Includes VAT and shipping to mainland Spain. Installation and adaptations are valued separately. With MiSet wired. Installation not included.
