Saunier Duval IsoFast MiConnect MA 35-CS/1-Cf boiler
Condensing boiler · New equipmentSaunier Duval IsoFast MiConnect MA 35-CS/1-Cf

Saunier Duval IsoFast MiConnect MA 35-CS/1-Cf 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
4.0–30.0 kW 80/60 °C
Domestic hot water flow rate
19.9 l/min at ΔT 25 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 ↗

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 ↗

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.

Its micro-accumulation system helps to have hot water ready for everyday use. It is not equivalent to a large tank: the choice should take into account the flow rate you need and how many taps or showers you will use at the same time.

Guide for this modelDoes your boiler show an error?Saunier Duval IsoFast MiConnect MA 35-CS/1-CfSee codes
Guide

What to check before installing this boiler

The choice of equipment does not replace the inspection of the installation by a qualified professional.

  1. Confirm the model and commercial reference, the type of gas, and the supply configuration in the manufacturer's documentation.
  2. Ask a qualified installer to assess the heating and domestic hot water demand; compare measured flow rates at the same temperature difference.
  3. Check dimensions, connections, flue gas evacuation, condensate drainage, and controls compatible with the existing installation.
  4. 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

Technical data of Saunier Duval IsoFast MiConnect MA 35-CS/1-Cf

Brand
Saunier Duval
Model
Saunier Duval IsoFast MiConnect MA 35-CS/1-Cf boiler
Status
New
Supply scope
Installation not included.
Shipping
Included in mainland Spain. Please confirm the deadline.
Commercial reference
125225229

Specifications and dimensions of the model

Compare each magnitude under its testing conditions: heating, domestic hot water, efficiency, and dimensions.

Useful heating power, minimum-maximum at 80/60 °C (G20)
4.0–30.0 kW
Heating
Useful heating power, minimum-maximum at 50/30 °C (G20)
4.3–32.5 kW
Heating
Nominal power for domestic hot water
34.8 kW
Hot water
Domestic hot water flow rate at ΔT 25 K, inlet 10 °C
19.9 l/min
Hot water
Micro-accumulation DHW
3 l
Hot water
Seasonal heating efficiency
94 %; class A; DHW profile XL
Efficiency and consumption
Dimensions (height × width × depth)
893 × 470 × 392 mm
Dimensions and connections
Fuel
Natural gas; professional conversion to propane G31
Dimensions and connections
Manufacturer's sources

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.

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

Frequently asked questions: condensing boilers 125225229

What power does it offer for heating?
It operates from 4.0 to 30.0 kW useful at 80/60 °C and from 4.3 to 32.5 kW at 50/30 °C. The required power is determined by the thermal demand and the emitters of the installation.
Can it supply two showers at 8 l/min?
Two showers of 8 l/min require 16 l/min. The manufacturer states 19.9 l/min with an inlet temperature of 10 °C and a ΔT of 25 K; at an outlet temperature of 35 °C, this difference corresponds to 25 K. If the water exits at 40 °C, the difference is 30 K; the indicative calculation 19.9 × 25/30 gives about 16.6 l/min. It could thermally cover that consumption under those conditions, but pressure, the network, and control also matter: it is not a certified flow rate at ΔT 30 K nor a guarantee for two showers.
What do the 3 liters of micro-accumulation provide?
The 3 liters form a small internal reserve to improve the response when opening the tap. They are not a large sanitary tank nor a reserve to maintain two simultaneous showers.
What are its dimensions?
The body measures 893 × 470 × 392 mm (height × width × depth). The final space must include connections, drainage, and service clearances.
Can I control it via WiFi?
Yes, through the compatible MiGo Link accessory, which is purchased separately.
What gas does it use?
It is prepared for natural gas and can be adapted to propane using the parameters provided by the manufacturer. The conversion and commissioning are the responsibility of a professional.
Does the price include installation and shipping?
Includes VAT and shipping to mainland Spain. Installation and adaptations are valued separately. Installation not included.
Shipping to the mainland included
New equipment
Separate installation
Informed purchase
Saunier Duval IsoFast MiConnect MA 35-CS/1-Cf boiler