Heat Pump Electronics for France from Hong Kong: 528,000 Heat Pumps Were Sold in 2025, the Largest Volume in Europe, and the Walsin S2 Safety Capacitor Series Lists 84 X7R Part Numbers but Only 17 at 2.2 nF or More, With 3 S2 Lines on the Shelf

Heat pump electronics for France lean on mains filtering, and the Walsin Technology (Walsin) S2 X1/Y2 safety chip capacitor series lists 84 X7R part numbers, but only 17 reach 2.2 nF or more and only 1 reaches 10 nF. Our Hong Kong shelf holds 3 S2 lines, at 470 pF, 1 nF and 2.2 nF.

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Venatech Limited, an authorised Walsin distributor in Hong Kong, wrote this from the Walsin MLCC export (24,026 rows, 23,601 distinct part numbers) and our stock list as at 23 September 2026 (1,125 distinct part numbers). It is for a design or sourcing engineer at a French maker of heat pumps, HVAC inverters or appliance electronics who is crossing a surface-mount safety capacitor. Every part number is real and every count is ours, re-measured on 10 November 2026. The market statement names its source and the day we fetched it.

What did Effy report on French heat pump sales, and why does a component buyer care?

It reported that France led Europe in volume. According to Effy on 11 September 2026, France sold 528,000 heat pumps in 2025, the largest volume in Europe, in a market where the European Heat Pump Association counted about 2.9 million residential units across 21 countries, up 13 percent on 2024.

The article also says French manufacturers described first-half 2026 sales as much better than a year earlier, without giving a figure. Those are the sources’ statements, not ours. The conclusion we draw is ours: an inverter-driven heat pump has a mains input, and mains inputs carry filter capacitors whose safety class matters. We have no relationship with any French maker, and we say nothing about what any of them buys.

How many Walsin S2 safety capacitors exist, and what voltage is the export column?

There are 165 distinct part numbers on 173 rows, and the voltage column is not the working voltage. We parsed the S2 series in the Walsin export and found 173 rows, 165 distinct part numbers, in four case sizes, 1808, 1812, 2211 and 2220: 81 NP0 and 84 X7R.

The Rated Voltage field reads 5,000 Vdc on 163 rows and 6,000 Vdc on 10, but Walsin’s S2 approval sheet, which we hold, calls that figure the peak impulse voltage and lists the working ratings as X1 310 Vac, Y2 250 Vac and 1,500 Vdc on all models. Reading the export column as a working voltage would be wrong by a factor of more than three. Eight rows are repeats of seven part numbers with different thickness. Our post on X1/Y1 versus X1/Y2 safety capacitors explains the classes.

How high in capacitance does the X7R S2 ladder go?

It thins out quickly above 2.2 nF. We counted the 84 X7R part numbers: 21 distinct values from 100 pF to 10 nF, 17 part numbers at 2.2 nF or more, and a single part at 10 nF, S242B103K502 in 1808.

By case size the X7R ceiling in the export is 1 nF in 1812, 2.7 nF in 2211, 4.7 nF in 2220 and 10 nF in 1808. NP0 stops at 680 pF in the export. A filter that needs 4.7 nF or more per line has very few S2 candidates, and those that exist are in the largest bodies. The approval sheet’s own table grid runs on to 0.1 uF but fills only to 10 nF. We have not seen this ladder counted anywhere.

Which Walsin parts cross a 2.2 nF, X7R, plus or minus 10 percent, 2211 safety brief, and what differs?

One matches exactly, and the neighbours differ in tolerance or body. For a 2.2 nF, X7R, plus or minus 10 percent, 2211 brief, S252B222K502 is the single exact match; its siblings differ in tolerance, S255B222K502 differs in case, and S242B102K502 is a different value.

The reader’s incumbent goes in the last column.

Walsin part	Description	On shelf 23 Sep 2026	Match / mismatch with the brief	Your incumbent
S252B222K502	S2 X1/Y2, 2211, X7R, 2.2 nF, plus or minus 10%, 5,000 V impulse, 2.50 plus or minus 0.30 mm	Yes	Match on size, dielectric, value, tolerance and impulse rating
S252B222J502	S2 X1/Y2, 2211, X7R, 2.2 nF, plus or minus 5%, 5,000 V impulse	No	Mismatch: tolerance is plus or minus 5 percent, tighter
S252B222M502	S2 X1/Y2, 2211, X7R, 2.2 nF, plus or minus 20%, 5,000 V impulse	No	Mismatch: tolerance is plus or minus 20 percent, wider
S255B222K502	S2 X1/Y2, 2220, X7R, 2.2 nF, plus or minus 10%, 5,000 V impulse	No	Match on the electrical fields; mismatch in case size
S242B102K502	S2 X1/Y2, 1808, X7R, 1 nF, plus or minus 10%, 5,000 V impulse	Yes	Mismatch: 1 nF, not 2.2 nF; the nearest 1808 shelf part

A match in the table is a match on the export fields, no more. The certificate numbers, standards and working ratings sit in the approval sheet, so read it for your exact part number. Confirm against both datasheets and qualify in your own circuit. Our post on how to cross-reference an MLCC shows the field-by-field method.

What does the Hong Kong shelf hold in S2 safety capacitors?

Three lines, all X7R at 2211 or 1808. Our stock list as at 23 September 2026 holds 3 S2 codes: S242B102K502 (1 nF, 1808), S252B222K502 (2.2 nF, 2211) and S252B471K502ZT (470 pF, 2211).

The third code ends in ZT; per the approval sheet’s ordering key the letters before the packaging position encode the termination and the final T the 7 inch reel, so it is a termination variant of S252B471K502 and the export, which leaves its Termination field empty on 166 of 173 S2 rows, mostly cannot tell the two apart. Ask which termination you receive. The ready stock list is a dated snapshot, never live-synced, and the MLCC range lists the families. If your value is not stocked, ask for a to-order enquiry through the site.

What will we not tell you about heat pumps?

Anything about your drive, your EMC test results or your product approval. Of the 28 Walsin datasheets we hold, 26 cover MLCC series, and none names a heat pump or HVAC product, so every count here is catalogue coverage, not suitability.

We make no claim that any S2 part suits a heat pump, a filter topology or a particular safety standard in your product, and we do not state the content of any standard from memory. We hold no ISO 9001 or IATF 16949 certificate. We hold no office, entity or stock in France; our locations are Hong Kong, Shenzhen, Singapore and Jiangmen, with Chengdu in preparation. We give no legal, customs or conformity advice; confirm with your compliance team. Qualification stays with you.

How can Venatech help a French heat pump electronics buyer?

How Venatech helps starts with a free paste box. The cross-reference tool, called VenaMatch, decodes 18 manufacturers’ part numbers and covers 800,000+ crossable parts; paste up to 500 part numbers or an Excel or CSV file and every Walsin candidate returns with each field marked match or mismatch. Load a whole BOM for a review. The ready-stock list is a Hong Kong snapshot dated 23 September 2026.

Worked example from our own export: the 2.2 nF, X7R, plus or minus 10 percent, 2211 brief returned 1 exact part among 6 at the value, and it is stocked. Venatech Limited is an authorised Walsin Technology distributor in Hong Kong; Stackpole and Viking are lines we supply. We serve from Hong Kong, welcome small lots, and you request a quote through the site. We hold 28 Walsin datasheets, 451 pages, and send them on request.

The short version

For a French heat pump designer, an S2 safety chip is a thin ladder: 165 part numbers, 84 X7R, 17 at 2.2 nF or more, one at 10 nF, and an export voltage that is the impulse rating, not the working rating. Three lines are on our shelf. Read the approval sheet for the working voltage.

Send us one safety capacitor line from your BOM, with the value, tolerance, body size and class you can accept, and we will return the Walsin parts with every difference stated. If your filter needs 4.7 nF per line, which case size does your layout allow?

Sources

Fetched 10 November 2026.

• Effy, “Pompes a chaleur : le marche retrouve la croissance en 2026” (European Heat Pump Association figures), 11 September 2026: https://www.effy.fr/pro/actualite/pompes-a-chaleur-le-marche-retrouve-la-croissance-en-2026
• Walsin S2 approval sheet 16_Safety_X1Y2_General_S2.pdf (Apr.2026), Walsin MLCC export and Venatech ready-stock workbook as at 23 September 2026, re-measured 10 November 2026 (internal files).

Related reading

• X1/Y1 versus X1/Y2 safety capacitors
• How to cross-reference an MLCC, field by field
• MLCC DC bias and voltage derating
• Free cross-reference tool (VenaMatch)
• Ready stock, Hong Kong snapshot dated 23 September 2026

Last reviewed 10 Nov 2026.

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Frequently asked questions

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