Transformers of different functions
A Transformer feed or insulation must not be confused with a spark generator. Replacement requires contrasting the function, stresses and Connection of the original unit.

Transformer Saunier Duval Thelia Twin 28 E reconditioned. Transformer rectangular black with front label and green Connection grids. Type indicated on label: Transformer insulation. Primary indicated: 220 V. Contrast the voltages indicated, the terminal arrangement and the fixing points.
Compare the label, assembly and layout of connections. Primary and secondary data identify the electrical version; the shape of the housing alone does not determine them.
The assembly, connections and features described in this unit. Compare the views from the same angle and the complete identification of the Part removed.
Choose a photo of your part to view it beside this unit. Compare the labels, connectors and mounting points from the same angle.
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Application listed in the catalogue: Saunier Duval Thelia Twin 28 E. The variant and configuration must match the installed equipment; this does not establish compatibility with other models.
No models are documented for that search.
Application taken from the catalogue, pending comparison with the installed variant. This does not constitute compatibility certified against an exploded diagram.
A Transformer feed or insulation must not be confused with a spark generator. Replacement requires contrasting the function, stresses and Connection of the original unit.
We repair boilers in Madrid and the surrounding areas. Installation is arranged separately from the purchase of the part.
Transformer rectangular black with front label and green Connection grids. Compare these details with the removed Part and its complete identification.
Type indicated on the label: Transformer isolation; Primary indicated: 220 V; Secondary indicated: 230 V. These are readings from the photographed unit and not a list of equivalent references.
This product page identifies the catalogued application Saunier Duval Thelia Twin 28 E. It does not establish equivalence with other versions; service documentation linking Part to the specific model is required to extend compatibility.