Webasto · Heater

Webasto Air Top 2000

The Air Top 2000 is Webasto’s smallest diesel air heater: 2 kW nominal, modulating down to 0.9 kW, and the one found in most sailing and motor boats up to about 40 ft, as well as in camper vans and truck cabs. It draws fuel from the boat’s tank through its own dosing pump, burns it in a sealed chamber with separate combustion-air intake and exhaust, and blows cabin air over the heat exchanger. This page covers the ST generation (12 V petrol or diesel, 24 V diesel, including the 12 V marine version) and its successor, the STC, which brought a new control unit, the DP42 dosing pump and new control elements (rotary rheostat, MultiControl/SmartControl, SmarTemp in North America) while keeping most burner and casing parts. Webasto’s spare parts lists print ST and STC side by side; where numbers differ, the notes say which fits which.

Manuals & documents

The links go straight to Webasto. We host no manuals or drawings — the manufacturer’s copy is the current one.

Wear parts & part numbers

PartOEM numberAlso fitsNote
Service kit9037043A · 9045249A1,2,3—12 V diesel, ST and STC: burner insert with glow pin, burner tube and gasket set / the same kit without the burner tube. 9037050A is the drive service kit for 12 V petrol only. Butler Technik lists 4111814A as an older kit number.
Glow pin1322420A · 1322411A1,2,3,4—12 V (petrol and diesel) / 24 V (diesel), ST and STC. Butler Technik also lists the older numbers 9005086A / 9005087A.
Burner insert1322585A · 9005092B1,2,3,4—Diesel 12 V and 24 V, without glow pin (reuse it or order it separately) / petrol, with flame detector and glow pin. ST and STC. 24 V diesel with glow pin fitted: 1322848A; bare petrol insert 84883A. Butler Technik lists 1302799A as an older number.
Gasket set1322586A · 5010159A2,1,5,4—Motor, burner and base gaskets; the same set for Air Top 2000, 2000 S, ST and STC, petrol and diesel: EU number / North American number. Butler Technik sells it as 82302A. Webasto: renew all gaskets every time the heater is removed or opened.
Burner tube1322722A1,2,3—Petrol and diesel, ST and STC. Butler Technik lists 82284A as the older number.
Heat exchanger1302805A · 9005090A1,2,3,4—Diesel (12 V and 24 V) / petrol, ST and STC. Webasto requires a genuine replacement ten years after first use.
Overheat sensor1322850A1,2,3,4—Petrol and diesel, ST and STC, 12 V and 24 V. Faults F11 and F14 point at this sensor or its seating. Butler Technik lists 9005084A as the older number.
Flame detector1322426A1,2,4—Petrol heaters only (ST B / STC B); the diesel versions sense the flame through the glow pin.
Hot-air fan1302774B1,2,4—Heating-air impeller on the drive shaft, ST and STC from production number 976400 (earlier heaters have a different fan and inlet hood). The combustion-air fan is part of the drive assembly and is not sold on its own.
Fan drive assembly9032300A · 9032301A · 9032299A1,3—STC: 12 V diesel / 24 V diesel / 12 V petrol. Motor with combustion-air fan and fuel-pump cable; order the gasket set with it. Butler Technik also lists 9037051A for the 12 V diesel drive.
Fan drive assembly1302787B · 1322696A2,1—ST: 12 V / 24 V, with the long pump cable. 1303846A (12 V) and 1303848A (24 V) are the same drives supplied with fan and inlet hood.
Control unit9032303B · 9032302B · 9032304B1,3—STC, control unit SG 1574: 12 V diesel / 24 V diesel / 12 V petrol. The 12 V diesel marine version has its own unit, 9032308C (EU list). Butler Technik sells the 12 V diesel unit as 9032303A / 1323356B.
Control unit9013146A · 1322865A · 9013148A · 9021899B2,4—ST, control unit SG 1574: 12 V diesel / 24 V diesel / 12 V petrol / 12 V diesel marine version (North American list; the EU list gives 9013149A).
Control / rheostat1322581A1,3—Rotary control with fault lamp, ST and STC, 12 V and 24 V. 82820B is the version with panel, 5010068A the North American ‘heater control’. Butler Technik lists 82819B / 83052B as older numbers.
Fuel dosing pump9024802A1,2—DP42.4 with damper, diesel STC, and per Webasto’s EU list the replacement for the ST diesel pump. 9039917A is the same pump without damper, 478814 the damper, which is mandatory with diesel. Petrol STC: DP42 1324533A (pump only) or 1326524A (with hanger).
Fuel dosing pump5001503A · 86116B2—The original ST pumps, DP30.02: 12 V (North American list; EU list 86115B) / 24 V.
Fuel filter1319466A1,2—In-line filter for the heater’s 2 mm fuel line, petrol and diesel, ST and STC. Webasto: do not fit a non-Webasto filter instead.
Exhaust silencer1320841A · 1320895A1,2—22 mm, petrol and diesel, ST and STC: standard / with stainless tube. For boats Webasto lists the stainless flexible exhaust 22 mm (50900126A 1 m, 5000322A 5 m) and the condensation drain 5000694A.
Intake silencer9026725A · 98141A1,3—22 mm; EU list number / North American STC list number, each backed by one list only. Required when the intake hose is longer than 0.6 m.

Numbers checked against the sources below on 12 October 2026. Always confirm against your serial number and exact type before ordering.

Service intervals

TaskInterval
Monthly runEvery four weeks, in summer too: run the heater for about 10 minutes so the dosing pump and fan do not seize6,7
Season checkAt the start of every heating season: have the heater checked by a Webasto workshop6
Heat exchanger cleanReplace with a genuine part ten years after first use; the year of first use is on the type plate7
ExhaustExhaust line: renew with genuine parts ten years after first use, together with the heat exchanger7
GasketsRenew every gasket between dismantled parts and the base seal whenever the heater is removed or opened; the exhaust temperature sensor and its spring clip after every removal1

Schedule from the Air Top 2000 STC operating instructions (9032569C, 2024), the Air Top 2000 ST operating instructions (5010533A) and Webasto’s spare parts list. Note that the 2024 STC operating instructions print a shorter fault-code table than the full F00–F15 list given under specifications.

Specifications

Heat output0.9–2.0 kW (3070–7000 BTU/h), stepless, diesel; petrol 1.0–2.0 kW8
Fuel consumption0.12–0.24 l/h diesel; 0.14–0.27 l/h petrol9
Power consumption14–29 W in the control range (fan and dosing pump); more during the glow phase at start8
Voltage12 V (petrol and diesel) or 24 V (diesel only); operating range 10.5–16 V / 21–32 V (marine manual: 20.5–31 V)8,10
FuelSTC D: diesel EN 590, biodiesel EN 14214, HVO EN 15940; STC B: petrol EN 228. ST D: diesel EN 590; ST B: petrol EN 2286,7
Air flowmax. 93 m³/h against 0.5 mbar at 4750 rpm fan speed8
Fault codesF00 control unit · F01 no start (after two attempts) · F02 flame-out (more than 3 times) · F03 under- or over-voltage · F04 premature flame recognition · F05 flame detector (petrol) open/short · F06 temperature sensor open/short · F07 dosing pump open/short · F08 fan motor open/short/overload/blocked · F09 glow pin open/short · F10 overheating · F11 overheat sensor open/short · F12 heater lock-out (three failed starts) · F14 overheat sensor wrongly positioned · F15 set-point device open/short. Shown as flashes of the rheostat lamp or on the display of the control element. Note: the 2024 STC operating instructions print a shorter table (F00–F03 and F10, F10 there meaning lock-out); this is the full list from the ST operating instructions and the STC installation manual8,7,6
Lock-out resetLock-out (F12): with the heater switched on, cut the supply (pull the fuse) for at least 20 s, switch the heater off, reconnect; fix the cause first7
Weight2.6 kg9
Dimensions311 × 120 × 121 mm (installation manual); datasheet 310 × 120 × 118 mm8,9
VersionsComplete heater numbers (type plate): ST D 12 V 1302772B (EU) / 9014839C (NA), ST D 12 V marine 9010564B, ST D 24 V 1302773B / 9022049A (obsolete), ST B 12 V 1302771B / 9015455A; STC D 12 V 9032290B / 5014272A, STC D 12 V marine 9032297C, STC D 24 V 9032291B / 9034523B, STC B 12 V 9032288B / 5014275A2,1

Good to know

  • Always switch off at the control element and let the fan run on; cutting the power before the after-run has finished can damage the heater.6
  • F01/F02 (no start, flame-out): check the fuel supply, filter and dosing pump, the glow pin, and that intake and exhaust are clear. F03 is usually a tired battery or a thin supply cable.8
  • Feed the heater from the service battery, not the starter battery, and keep the hot-air inlet and outlets clear: blocked ducting trips the overheat sensor.10
  • When ordering parts note ST or STC, 12 V or 24 V, petrol or diesel and the production number on the type plate: the hot-air fan and inlet hood changed from production number 976400, and control units and drives are version specific.2
  • New installs on a boat: keep the exhaust short (max. 2.5 m with silencer, 5 m without), fit the intake silencer if the intake hose is over 0.6 m, insulate an exhaust over 2 m, and use the stainless marine exhaust with a condensation drain.10
  • After filling the tank with winter diesel, run the heater for about 15 minutes so its own fuel line is purged of summer fuel.6

Videos & how-tos

Links to YouTube, nothing embedded. The maker’s own channel comes first; the rest are channels we found clear and correct for this model.

Fitted in

Boats whose builder lists it as standard or optional equipment:

  • Saxdor 320 — Webasto AT 2000 (GTO and GT lists of 2023 (spring to September 2023): option ‘Webasto AT 2000 Heating’, not combined with the climate package)

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Sources

  1. techwebasto.com/documentation/heater/at-2000-stc-parts-listing/viewdocument/398.html
  2. techwebasto.com/documentation/heater/at-2000-st-parts-listing/download.html
  3. butlertechnik.com/air-top-2000stc
  4. pbautoelectrics.co.uk/product-category/parts/heaters/webasto/webasto-heater-parts/webasto…
  5. butlertechnik.com/item/Webasto/Air-Top-2000-S-ST-STC-Gasket-Set-82302A-1322586A/5N5
  6. dealers.webasto.com/service/files_content.aspx?Files_FileId=30916
  7. techwebasto.com/old/marine_main/blueheat/om_5010533A_Air_Top_2000_ST.pdf
  8. techwebasto.com/documentation/heater/at-2000-stc-installation-manual/viewdocument/307.html
  9. webasto.com/content/dam/global-brand/business-fields/heating/air-heater/documents/Datashe…
  10. techwebasto.com/documentation/marine/at-2000-st-installation-instructions-marine/viewdocu…

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