Nefit (Bosch) TopLine HR 50 II spare parts

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In brief

Instalpunt supplies 106 original parts for the Nefit (Bosch) TopLine HR 50 II, including fans, sensors, pressure sensors. Order online.

106Spare parts
50In stock
€2.82From
21Types
availableExploded view

Looking for parts for the Nefit (Bosch) TopLine HR 50 II (boiler)? Below are all 106 original parts, grouped by part type, with the matching exploded view. Choose a type to jump straight to the right table.

View the interactive exploded view →

Quick left to the right part for the Nefit (Bosch) TopLine HR 50 II

Part	From	Delivery
Fan Nefit fan 70 kW 230V for TopLine	€362.29	In-stock items usually arrive within 3–5 working days, made-to-order items within 5–7 working days (a longer lead time is shown on the product page).
Pressure sensor Nefit pressure sensor with click connection for TopLine and ProLine etc.	€62.59	In-stock items usually arrive within 3–5 working days, made-to-order items within 5–7 working days (a longer lead time is shown on the product page).
Heat exchanger Nefit heat exchanger for Topline 50-100 kW	€3,135.73	In-stock items usually arrive within 3–5 working days, made-to-order items within 5–7 working days (a longer lead time is shown on the product page).
Burner control unit Nefit burner control unit UBA 3.5 for TopLine	€233.77	In-stock items usually arrive within 3–5 working days, made-to-order items within 5–7 working days (a longer lead time is shown on the product page).

Prices incl. VAT, taken directly from our checkout. Below is the complete parts list for this model.

Installer or self-employed engineer? Create a business account: prices excl. VAT and invoices in your company name.

Fans for the Nefit (Bosch) TopLine HR 50 II (2) all Nefit (Bosch) fans →

Part	Item no. / mfr. no.	Price	Stock
Nefit fan 70 kW 230V for TopLine	8026713 Mfr. no. 73924	€362.29	In stock	View & order
Rewind reconditioned fan for Bosch Topline HR 50/70 (73924)	8930174	€277.51	In stock	View & order

Sensors for the Nefit (Bosch) TopLine HR 50 II (1) all Nefit (Bosch) sensors →

Part	Item no. / mfr. no.	Price	Stock
Nefit safety sensor for TopLine	8026766 Mfr. no. 7101532	€48.55	In stock	View & order

Pressure sensors for the Nefit (Bosch) TopLine HR 50 II (1) all Nefit (Bosch) pressure sensors →

Part	Item no. / mfr. no.	Price	Stock
Nefit pressure sensor with click connection for TopLine and ProLine etc.	8026706 Mfr. no. 8718600019	€62.59	In stock	View & order

Pumps for the Nefit (Bosch) TopLine HR 50 II (1) all Nefit (Bosch) pumps →

Part	Item no. / mfr. no.	Price	Stock
Nefit pump Stratos Para 25/1-8 for TopLine	8029582 Mfr. no. 7736700123	€866.11	Made-to-order item	View & order

Heat exchangers for the Nefit (Bosch) TopLine HR 50 II (1) all Nefit (Bosch) heat exchangers →

Part	Item no. / mfr. no.	Price	Stock
Nefit heat exchanger for Topline 50-100 kW	8028938 Mfr. no. 8718600269	€3,135.73	In stock	View & order

Gas valves and gas control for the Nefit (Bosch) TopLine HR 50 II (3) all Nefit (Bosch) gas valves and gas control →

Part	Item no. / mfr. no.	Price	Stock
Nefit gas control valve 50-70kW	8029597 Mfr. no. 7736700143	€177.07	In stock	View & order
Nefit gas tap	8029584 Mfr. no. 7736700127	€275.35	Made-to-order item	View & order
Nefit venturi 2LL for TopLine	8029598 Mfr. no. 7736700145	€150.07	Made-to-order item	View & order

PCBs and controls for the Nefit (Bosch) TopLine HR 50 II (1) all Nefit (Bosch) PCBs and controls →

Part	Item no. / mfr. no.	Price	Stock
Nefit module box	8029608 Mfr. no. 7736700161	€67.99	Made-to-order item	View & order

Burner control units for the Nefit (Bosch) TopLine HR 50 II (1) all Nefit (Bosch) burner control units →

Part	Item no. / mfr. no.	Price	Stock
Nefit burner control unit UBA 3.5 for TopLine	8026787 Mfr. no. 7736700530	€233.77	In stock	View & order

Diverter valves and hydroblocks for the Nefit (Bosch) TopLine HR 50 II (3) all Nefit (Bosch) diverter valves and hydroblocks →

Part	Item no. / mfr. no.	Price	Stock
Nefit hydroblock flow single for TopLine	8029616 Mfr. no. 7736700357	€286.15	In stock	View & order
Nefit hydroblock return combi for TopLine	8029618 Mfr. no. 7736700359	€431.95	Made-to-order item	View & order
Nefit hydroblock return single for TopLine	8029615 Mfr. no. 7736700356	€201.91	Made-to-order item	View & order

Siphons and condensate drains for the Nefit (Bosch) TopLine HR 50 II (2) all Nefit (Bosch) siphons and condensate drains →

Part	Item no. / mfr. no.	Price	Stock
Nefit flexible condensate drain for ProLine and TopLine	8027352 Mfr. no. 7101535	€24.79	In stock	View & order
Nefit siphon for TopLine (e.g. TopLine HR 70 II) 7736700132	8029587 Mfr. no. 7736700132	€46.39	In stock	View & order

Burners for the Nefit (Bosch) TopLine HR 50 II (2) all Nefit (Bosch) burners →

Part	Item no. / mfr. no.	Price	Stock
Nefit burner cover old number: 73919	8026709 Mfr. no. 7101448	€119.83	In stock	View & order
Nefit burner for TopLine	8200015 Mfr. no. 8738901723	€327.19	In stock	View & order

Displays and controls for the Nefit (Bosch) TopLine HR 50 II (1) all Nefit (Bosch) displays and controls →

Part	Item no. / mfr. no.	Price	Stock
Nefit control panel	8027642 Mfr. no. 7746900119	€92.83	Made-to-order item	View & order

Maintenance and service kits for the Nefit (Bosch) TopLine HR 50 II (2) all Nefit (Bosch) maintenance and service kits →

Part	Item no. / mfr. no.	Price	Stock
Nefit ignition unit 50-100kW (service kit) for TopLine	80200188 Mfr. no. 8738901633	€126.31	In stock	View & order
Nefit gasket set F Topline I/II HR 50/70/100	81901152 Mfr. no. 8738901299	€60.43	In stock	View & order

Valves for the Nefit (Bosch) TopLine HR 50 II (6) all Nefit (Bosch) valves →

Part	Item no. / mfr. no.	Price	Stock
Nefit safety relief valve 3 bar for TopLine	8026741 Mfr. no. 7099949	€43.15	In stock	View & order
Nefit automatic air vent >= 50 kW	8029647 Mfr. no. 8738900323	€48.55	In stock	View & order
Nefit quick air vent 3/8" old number: 73409	8045200 Mfr. no. 7098666	€48.55	In stock	View & order
Nefit fill/drain valve old number: 73959	8026744 Mfr. no. 7101516	€51.79	Made-to-order item	View & order
Nefit safety relief valve 4 bar for TopLine	7900630 Mfr. no. 7095595	€60.43	In stock	View & order
Nefit pressure relief valve DN160 7736700125	80200130 Mfr. no. 7736700125	€251.59	Made-to-order item	View & order

Pressure gauges for the Nefit (Bosch) TopLine HR 50 II (2) all Nefit (Bosch) pressure gauges →

Part	Item no. / mfr. no.	Price	Stock
Nefit pressure gauge 0-10 bar old number: 73958 for TopLine	8026743 Mfr. no. 7101506	€34.51	Made-to-order item	View & order
Nefit thermometer round D63 TI103XD9-130°	8029576 Mfr. no. 5594710	€99.31	Made-to-order item	View & order

Electrical parts for the Nefit (Bosch) TopLine HR 50 II (9) all Nefit (Bosch) electrical parts →

Part	Item no. / mfr. no.	Price	Stock
Nefit fuse 5 AF/230V 10 pcs old number: 7099473 for TopLine and TrendLine etc.	8026767 Mfr. no. 8718601966	€44.23	In stock	View & order
Nefit transformer UBA 3.5	8026824 Mfr. no. 74595	€60.43	In stock	View & order
Nefit terminal connector blue	8027316 Mfr. no. 73775	€29.11	In stock	View & order
Nefit connection terminal orange	8027318 Mfr. no. 73777	€36.67	Made-to-order item	View & order
Nefit connection terminal green	8027314 Mfr. no. 73773	€29.11	In stock	View & order
Nefit terminal connector grey	8027315 Mfr. no. 73774	€36.67	Made-to-order item	View & order
Nefit terminal connector red	8027317 Mfr. no. 73776	€36.67	Made-to-order item	View & order
Nefit switch for e.g. TopLine HR 70 II 7100384	8029577 Mfr. no. 7100384	€67.99	Made-to-order item	View & order
Nefit strain relief for e.g. TopLine HR 70 II 7736700162	8029609 Mfr. no. 7736700162	€32.35	Made-to-order item	View & order

Cables and wiring harnesses for the Nefit (Bosch) TopLine HR 50 II (3) all Nefit (Bosch) cables and wiring harnesses →

Part	Item no. / mfr. no.	Price	Stock
Nefit wiring harness 24V for TopLine (e.g. TopLine HR 70 II) 7736700154	8029605 Mfr. no. 7736700154	€129.55	Made-to-order item	View & order
Nefit earth cable old number: 73947	8026734 Mfr. no. 7101474	€25.87	Made-to-order item	View & order
Nefit wiring harness 230v	8029603 Mfr. no. 7736700152	€107.95	Made-to-order item	View & order

Gaskets and seals for the Nefit (Bosch) TopLine HR 50 II (18) all Nefit (Bosch) gaskets and seals →

Part	Item no. / mfr. no.	Price	Stock
Nefit burner gasket for TopLine	8026708 Mfr. no. 7101446	€42.07	In stock	View & order
Nefit condensate tray gasket for Topline 45-100 kW	8027409 Mfr. no. 7746900152	€20.47	In stock	View & order
Nefit siphon gasket per 5 pcs for EcomLine and TopLine	8029545 Mfr. no. 7100742	€24.79	In stock	View & order
Nefit lip ring DN80	8026750 Mfr. no. 8738901447	€11.83	In stock	View & order
Nefit fan gasket old number: 73920 for TopLine	8026710 Mfr. no. 7101450	€20.47	In stock	View & order
Nefit gasket fan/venturi 5 pcs old number: 73565S for TopLine	8029026 Mfr. no. 7099712	€21.55	In stock	View & order
Nefit gasket venturi/gas control valve 5 pcs old number: 73569S for TopLine	8020594 Mfr. no. 7099710	€21.55	In stock	View & order
Nefit O-ring 9.92 x 2.62 mm 10 pcs	8027376 Mfr. no. 7101646	€28.03	In stock	View & order
Nefit O-ring heat exchanger 29.74 x 3.53 mm (10 pcs) for EcomLine and TopLine	8020257 Mfr. no. 7098986	€26.95	In stock	View & order
Nefit lip seal 50 mm 5 pcs	8029024 Mfr. no. 7099058	€43.15	In stock	View & order
Nefit O-ring 36.09 x 3.53 mm 10 pcs old number: 73972	8026755 Mfr. no. 7101488	€34.51	In stock	View & order
Nefit O-ring 18.72 x 2.62 mm (10 pcs)	8029234 Mfr. no. 8718601961	€17.23	In stock	View & order
Nefit sealing ring 28.8x23.4x3 mm	8029589 Mfr. no. 7736700134	€18.31	In stock	View & order
Nefit sealing ring 44 x 32 x 3 mm	8029630 Mfr. no. 7746700417	€37.75	In stock	View & order
Nefit sealing ring 58 x 45 x 4 mm	8029613 Mfr. no. 7736700354	€9.67	Made-to-order item	View & order
Nefit O-ring 10 pcs for e.g. TopLine HR 70 II 7736700861	8029625 Mfr. no. 7736700861	€23.71	Made-to-order item	View & order
Nefit O-ring 9.19 x 2.62 mm	8029580 Mfr. no. 7101534	€47.47	Made-to-order item	View & order
Nefit O-ring pump for TopLine	8029583 Mfr. no. 7736700124	€26.95	Made-to-order item	View & order

Pipes, tubes and hoses for the Nefit (Bosch) TopLine HR 50 II (7) all Nefit (Bosch) pipes, tubes and hoses →

Part	Item no. / mfr. no.	Price	Stock
Nefit connection nipple for e.g. TopLine HR 70 II 7736700150	8029602 Mfr. no. 7736700150	€66.91	In stock	View & order
Nefit condensate drain pipe old number: 73075 for TopLine	8027604 Mfr. no. 7101531	€29.11	In stock	View & order
Nefit gas hose for e.g. TopLine HR 70 II 7736700147	8029599 Mfr. no. 7736700147	€40.99	In stock	View & order
Nefit flow/return pipe	8029601 Mfr. no. 7736700149	€75.55	In stock	View & order
Nefit adapter 100-150 8718600309	8029645 Mfr. no. 8718600309	€51.79	Made-to-order item	View & order
Nefit air intake pipe 70kW	8026716 Mfr. no. 73927	€66.91	Made-to-order item	View & order
Nefit flue gas pipe old number: 73935	8026724 Mfr. no. 7101404	€64.75	Made-to-order item	View & order

Casing and panels for the Nefit (Bosch) TopLine HR 50 II (4) all Nefit (Bosch) casing and panels →

Part	Item no. / mfr. no.	Price	Stock
Nefit condensate tray upper section (old number: 73934) for TopLine	8026723 Mfr. no. 7101402	€18.31	In stock	View & order
Nefit door for TopLine HR 50 II 7736701240	80200054 Mfr. no. 7736701240	€381.19	Made-to-order item	View & order
Nefit electronics box cover	8029607 Mfr. no. 7736700160	€93.91	Made-to-order item	View & order
Nefit casing pump group for TopLine	8029617 Mfr. no. 7736700358	€249.43	Made-to-order item	View & order

Fixing material for the Nefit (Bosch) TopLine HR 50 II (24) all Nefit (Bosch) fixing material →

Part	Item no. / mfr. no.	Price	Stock
Nefit clamping spring 5 pcs for e.g. 9000i AquaPower Plus HRC30 CW6 7099402	8029125 Mfr. no. 7099402	€22.63	In stock	View & order
Nefit air vent clip old number: 73973	8026756 Mfr. no. 7101430	€18.31	In stock	View & order
Nefit clamping bracket set	8027410 Mfr. no. 7746900186	€21.55	In stock	View & order
Nefit retaining clip old number: 73974	8026757 Mfr. no. 7746700069	€21.55	In stock	View & order
Nefit clamping screw M5 2 pcs	8028935 Mfr. no. 8718600166	€18.31	In stock	View & order
Nefit screw M5 x 16 mm 10 pcs old number: 73970	8026753 Mfr. no. 7101484	€29.11	Made-to-order item	View & order
Nefit screw M6 x 16 10 pcs old number: 73971	8026754 Mfr. no. 7101486	€29.11	Made-to-order item	View & order
Nefit screw 4.2 x 8.5 mm 10 pcs old number: 73988	8026763 Mfr. no. 7100748	€28.03	Made-to-order item	View & order
Nefit countersunk screw M5 x 16 mm 10 pcs old number: 74597S	8026803 Mfr. no. 7746900595	€28.03	Made-to-order item	View & order
Nefit screw M5 10 pcs old number: 74596S 7100549	8027474 Mfr. no. 7746900594	€29.11	Made-to-order item	View & order
Nefit screw M5 x 12 mm	8029610 Mfr. no. 7736700351	€47.47	Made-to-order item	View & order
Nefit screw M4 x 10 mm	8029612 Mfr. no. 7736700353	€47.47	Made-to-order item	View & order
Nefit terminal connector 3-pin PS grey	8029641 Mfr. no. 7747023985	€47.47	Made-to-order item	View & order
Nefit terminal connector 3-pin PZ violet	8029642 Mfr. no. 7747023986	€47.47	Made-to-order item	View & order
Nefit terminal connector 3-pin PH green	8029640 Mfr. no. 7747023983	€61.51	Made-to-order item	View & order
Nefit terminal connector 3-pin white	8029639 Mfr. no. 7747023981	€47.47	Made-to-order item	View & order
Nefit bracket IO mounting plate	8029606 Mfr. no. 7736700159	€53.95	Made-to-order item	View & order
Nefit flange for e.g. TopLine HR 70 II 7736700431	8029624 Mfr. no. 7736700431	€51.79	Made-to-order item	View & order
Nefit handle blue for ball valve	8029575 Mfr. no. 5594684	€67.99	Made-to-order item	View & order
Nefit angled screw connection for e.g. TopLine HR 70 II 7736700142	8029596 Mfr. no. 7736700142	€62.59	Made-to-order item	View & order
Nefit handle red for ball valve	8029574 Mfr. no. 5594682	€67.99	Made-to-order item	View & order
Nefit clamp for e.g. 9000i AquaPower Plus HRC30 CW6 7101370	8029578 Mfr. no. 7101370	€8.59	Made-to-order item	View & order
Nefit wall bracket old number: 73965	8026749 Mfr. no. 7101386	€45.31	Made-to-order item	View & order
Nefit support for e.g. TopLine HR 70 II 7736700130	8029586 Mfr. no. 7736700130	€50.71	Made-to-order item	View & order

Other parts for the Nefit (Bosch) TopLine HR 50 II (12)

Part	Item no. / mfr. no.	Price	Stock
Nefit union nut 5 pcs	8024661 Mfr. no. 7099224	€34.51	In stock	View & order
Nefit test nipple cap 2 pcs	8026726 Mfr. no. 7101424	€26.95	In stock	View & order
Nefit drain pipe for e.g. TopLine HR 70 II 7736700424	8029621 Mfr. no. 7736700424	€21.55	In stock	View & order
Nefit flue adapter 100/150	8029629 Mfr. no. 7746700196	€62.59	In stock	View & order
Nefit mounting angle 50-70kW	8029600 Mfr. no. 7736700148	€30.19	Made-to-order item	View & order
Nefit brand badge Nefit for e.g. TrendLine HRC25 CW4 8718600735	8029383 Mfr. no. 8718600735	€28.03	Made-to-order item	View & order
Nefit gas pipe	8029588 Mfr. no. 7736700133	€147.91	Made-to-order item	View & order
Nefit air inlet adapter 100 mm old number: 73938	8026727 Mfr. no. 7101412	€34.51	Made-to-order item	View & order
Nefit door seal rubber	8029646 Mfr. no. 8718600350	€34.51	Made-to-order item	View & order
Nefit support ring gas supply set 5 pcs old number: 73479S	8024651 Mfr. no. 7098962	€34.51	Made-to-order item	View & order
Nefit transport guide rail	8029585 Mfr. no. 7736700128	€61.51	Made-to-order item	View & order
Nefit lock	8029614 Mfr. no. 7736700355	€75.55	Made-to-order item	View & order

Exploded views of the Nefit (Bosch) TopLine HR 50 II

Click an exploded view to enlarge it. The position numbers are shown next to each part.

Nefit (Bosch) TopLine HR 50 II error codes

Is there a code on the display? For each code: what it means for this series, what you can check yourself and which part is usually needed.

Fault code on your Nefit (Bosch) TopLine HR 50 II? This is the part type involved

Common Nefit (Bosch) fault codes and the part type that is usually the cause; the parts for this model are listed above. All codes explained: Nefit (Bosch) fault codes.

Code	What is going on	Part type
0C 283	The boiler is preparing for a burner start. The fan and pump are activated.	Fans
0L 284	The gas control valve is activated.	Gas valves and gas control
0Y 276	The flow temperature sensor has measured a temperature higher than 95°C.	Sensors
0Y 277	The safety temperature sensor has measured a temperature higher than 95°C.	Sensors
0Y 285	The return temperature sensor has measured a temperature higher than 95°C.	Sensors
1A 316	The flue gas temperature sensor has measured an excessive temperature.	Sensors

For guidance only: the same code can have a different cause depending on the situation.

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Frequently asked questions

Which parts are available for the Nefit (Bosch) TopLine HR 50 II?

The catalogue lists 106 original parts for the Nefit (Bosch) TopLine HR 50 II, including fans, sensors, pressure sensors, pumps. All parts are listed above, grouped by type, with part number and price.

How much does a fan for the Nefit (Bosch) TopLine HR 50 II cost?

The fans for this model cost €474.21 incl. VAT. Check the table "Fans" above for the right part number.

Are the parts for the Nefit (Bosch) TopLine HR 50 II in stock?

50 of the 106 parts are in stock; shipping to EU countries from €12.95 (€16.95 for more distant countries), usually 3–5 working days. Parts marked "Made-to-order item" are ordered specially for you; the delivery time is shown on the product page.

How do I know which part I need for the Nefit (Bosch) TopLine HR 50 II?

Search for the part by part number or use the exploded view of the Nefit (Bosch) TopLine HR 50 II.

Are these original Nefit (Bosch) parts?

Yes. All 106 parts in this list are original manufacturer parts for the Nefit (Bosch) TopLine HR 50 II, delivered with the correct part number.

How much do parts for the Nefit (Bosch) TopLine HR 50 II cost?

Parts for the Nefit (Bosch) TopLine HR 50 II range from €2.82 to €4,037.86 incl. VAT. The exact price of each part is shown in the tables above.

Can I return a part?

As a consumer you have a 14-day right of withdrawal. You may unpack and inspect the part; do not install or connect it. For a part that has been installed, connected or damaged we deduct the diminished value, up to the full price for circuit boards.