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Generac QT020 Generator Set

The Generac QT020 is a 20 kW Natural Gas, Propane standby generator set powered by a Generac 1.5L engine. It is available at 120/240 V and 120/208 V, single-phase and 60 Hz. It holds about 3.79 L (1.0 gal) of oil and 7.57 L (2.0 gal) of coolant, with a maximum ambient rating of 50 °C. Starting uses group-26 battery rated 525 CCA at 12 V. The set produces 63 dBA at 7 m.

20 kW
Standby
1.5 L
Displacement
3.785 L
Oil capacity
2
Document types

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Typical fuel consumption for 20–25 kW Bi-Fuel (NG/LP) generators →

Compare with other 20–25 kW Bi-Fuel (NG/LP) generators →

On this pageService partsSpecsEngineMaintenanceFuel consumptionDocumentsFAQ

Service parts for the QT020

Grouped by system, with how many of each the parts manual calls for.

Air intake

1 required
59402Air filter$18.00eBay

Oil system

1 required
244-A4531Oil filtersee priceAmazon

Belts

1 required
199-A4531Belt$89.99eBay

Ignition

1 required
275-A4531Spark plug$22.57eBay

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

FuelNatural Gas, Propane
Frequency60.0 Hz
Standby power20 kW
ControllerR-100
Oil capacity3.785 L
Voltage options120/240 V, 120/208 V
Phase1-phase/3-phase
Power factor1
Battery group26F
Battery cranking525CCA CCA
Battery voltage12 Volts V
Coolant capacity7.57 L
Max ambient50 °C
Sound level63.0 dBA @ 7 m

Engine

Generac 1.5L
Oil capacity3.8 L
Coolant capacity8.5 L
Displacement1.5 L
AspirationNaturally Aspirated
Rated speed3600 rpm

Maintenance & consumables

for the Generac 1.5L
ItemSpecCapacityPart #Interval
Air filter59402500 hr Amazon eBay $18.00
Oil filter244-A4531150 hr Amazon eBay
Battery—100 hr
BeltValve Timing199-A4531 Amazon eBay $89.99
CoolantLOW SILICATE, ETHYLENE GLYCOL BASE8.5 LITERS—
Oil15W-40—150 hr
Spark plug275-A4531 Amazon eBay $22.57

Common questions

What is the power rating of the Generac QT020?

The Generac QT020 is rated 20 kW standby.

Which engine powers the Generac QT020?

The Generac QT020 is powered by the Generac 1.5L engine.

What fuel type does the Generac QT020 take?

The Generac QT020 runs on Natural Gas, Propane.

How much oil does the Generac QT020 take?

The Generac 1.5L engine in the Generac QT020 has an oil capacity of 3.8 liters.

Which oil filter part number does the Generac QT020 take?

The Generac QT020 uses oil filter part number 244-A4531.

What air filter fits the Generac QT020?

The Generac QT020 uses air filter part number 59402.

Parts

106
Part #DescriptionQtySystem
100-A4531Gasket kit, Engine Overhaul1Gasket Amazon eBay
101-A4531Gasket kit, Engine Overhaul, Upper1Gasket Amazon eBay
103-A4531Gasket, Rocker Cover1Gasket Amazon eBay $53.89
104-A4531Gasket, PCV Valve1Gasket Amazon eBay
110-A4531Gasket, Engine Oil Filler Cap1Gasket Amazon eBay
113-A4531Gasket, Cylinder Head1Gasket Amazon eBay
118-97390VALVE COVER GASKET1Gasket Amazon eBay
122-A4531Oil Seal, Camshaft1Seal Amazon eBay $29.26
126-97390CAMSHAFT HOUSING GASKET1Gasket Amazon eBay
135-97390FRONT WATER JACKET COVER GASKET1Gasket Amazon eBay
135-A4531Gasket, Fuel Pump Hole Cover1Gasket Amazon eBay
139-97390FRONT MAIN OIL SEAL RETAINER GASKET1Gasket Amazon eBay
143-97390FRONT MAIN OIL SEAL1Seal Amazon eBay
145-97390CAMSHAFT OIL SEAL1Seal Amazon eBay
146-A4531Gasket, Rear Oil Seal Case1Gasket Amazon eBay
148-97390OIL PUMP DRIVE SHAFT SEAL RETAINER GASKET1Gasket Amazon eBay
150-97390REAR MAIN OIL SEAL RETAINER GASKET1Gasket Amazon eBay
153-97390REAR MAIN OIL SEAL1Seal Amazon eBay
154-97390REAR WATER JACKET COVER GASKET1Gasket Amazon eBay
158-A4531Oil Seal, Crankshaft, Rear1Seal Amazon eBay
160-97390OIL PAN GASKET1Gasket Amazon eBay
161-A4531O-ring, Engine Oil Filler1Seal Amazon eBay
164-A4531Gasket, Engine Oil Pan Drain Plug1Gasket Amazon eBay
172-A4531Gasket, Timing Belt Cover1Gasket Amazon eBay
173-A4531Gasket, Timing Belt Cover1Gasket Amazon eBay
174-A4531Gasket, Timing Belt Cover1Gasket Amazon eBay
175-A4531Gasket, Timing Belt Cover1Gasket Amazon eBay
176-A4531Gasket, Timing Belt Cover1Gasket Amazon eBay
177-A4531Gasket, Timing Belt Cover1Gasket Amazon eBay
178-A4531Gasket, Timing Belt Cover1Gasket Amazon eBay
179-A4531Strainer, Engine Oil Pan1Oil filter Amazon eBay $29.95
180-A4531Gasket, Oil Strainer1Gasket Amazon eBay
182-97390TIMING BELT1Belt Amazon eBay
199-A4531Belt, Valve Timing1Belt Amazon eBay $89.99
20439BELT, FAN (3600 RPM)1Belt Amazon eBay FridayParts $27.99
20621BELT, FAN (1800 RPM)1Belt Amazon eBay
211-97390VALVE SEAL8Seal Amazon eBay
222-97390OIL PUMP1Pump Amazon eBay
230-A4531Seal, Intake Valve Stem (Rubber)8Seal Amazon eBay
231-A4531Seal, Exhaust Valve Stem (Rubber)4Seal Amazon eBay
237-A4531O-ring, Engine Front Case (16.8)1Seal Amazon eBay
238-A4531Oil Seal, Crankshaft, Front1Seal Amazon eBay $43.40
244-A4531FILTER-OIL1Oil filter Amazon eBay
247-97390THERMOSTAT1Thermostat Amazon eBay
247-A4531Water Pump Assembly1Pump Amazon eBay $115.13
257-A4531GASKET-INTAKE MANIFOLD1Gasket Amazon eBay $29.26
258-A4531GASKET-EXHAUST MANIFOLD1Gasket Amazon eBay $37.34
261-97390WATER PUMP GASKET1Gasket Amazon eBay
265-97390WATER PUMP1Pump Amazon eBay
266-A4531O-ring, Distributor1Seal Amazon eBay
267-A4531Pick-up Kit, Distributor1Sensor Amazon eBay
275-A4531Spark Plug4Spark plug Amazon eBay $22.57
2903211" HOSE 9/32" I.D. BUNA N1Hose Amazon eBay
39379BELT, FAN1Belt Amazon eBay
4101-97390HEAD GASKET1Gasket Amazon eBay
4148-97390OIL PUMP DRIVE SHAFT COVER GASKET1Gasket Amazon eBay
48665GASKET, WATER OUTLET1Gasket Amazon eBay
50108Spring1Sensor Amazon eBay
5096712" HOSE - 5/8" I.D. (sold by foot)1Hose Amazon eBay
50968720MM HOSE, 3/4 SAE-20R31Hose Amazon eBay
53667TEMPERATURE SENSOR1Sensor Amazon eBay
57522LOW LEVEL SENSOR1Sensor Amazon eBay
59194HOSE 5/8 I.D. X 53"1Hose Amazon eBay
59401GASKET-CARBURETOR1Gasket Amazon eBay
59402FILTER ELEMENT1Air filter Amazon eBay $18.00
60108GASKET, OIL FILTER SUPPORT1Sensor Amazon eBay
61903FFUEL LINE, LPG - 35" LONG35"Hose Amazon eBay
69811CAP-OIL DRAIN HOSE1Hose Amazon $59.72 eBay
69860CHOSE ASM.-OIL DRAIN1Hose Amazon eBay
73912AIR FILTER ELEMENT1Air filter Amazon eBay $63.99
75130BELT, WATER PUMP1Belt Amazon eBay
75885THERMOSTAT1Thermostat Amazon eBay $25.14
79199BELT, WATER PUMP1Belt Amazon eBay $18.88
82130BMPU, SPEED SENSOR, RPM1Sensor Amazon Amazon eBay
97402INTAKE / EXHAUST GASKET2Gasket Amazon eBay
98690EXHAUST ADAPTER GASKET1Gasket Amazon eBay
98907THERMOSTAT GASKET1Gasket Amazon eBay
99021OIL FILTER1Oil filter Amazon eBay
99236Oil Press Switch1Sensor Amazon eBay $9.99 FridayParts $11.41
99478WATER TUBE GASKET1Gasket Amazon eBay
99512COIL COVER GASKET1Gasket Amazon eBay
A5275V-BELT (1800 RPM)1Belt Amazon eBay
A5554SEAL-QUAD RING, THERMOSTAT1Seal Amazon eBay $11.00
A5586V-BELT (3600 RPM)1Belt Amazon eBay $39.09
A6258HOSE, UPPER1Hose Amazon eBay
A6284HOSE, LOWER1Hose Amazon eBay
A6751SWITCH-WATER TEMPERATURE1Sensor Amazon eBay
A7006SEAL- O-RING1Seal Amazon eBay
A8584SWITCH-OIL PRESSURE1Sensor Amazon eBay
C3714HOSE ASSEMBLY NG/ LPG (1.5L)1Hose Amazon eBay
105-A4531Valve, PCV1Service part / kit Amazon eBay
109-A4531Cap Assembly, Engine Oil Filler1Service part / kit Amazon eBay
239-97390BREATHER1Service part / kit Amazon eBay
245-97390FLAME TRAP1Service part / kit Amazon eBay
261-A4531Cap Assembly, Distributor1Service part / kit Amazon eBay
264-A4531Rotor, Distributor1Service part / kit Amazon eBay
268-97390DISTRIBUTOR CAP1Service part / kit Amazon eBay
268-A4531Ignitor Kit, Distributor1Service part / kit Amazon eBay
269-97390ROTOR1Service part / kit Amazon eBay
270-97390PULSE COIL1Service part / kit Amazon eBay
271-97390VACUUM UNIT1Service part / kit Amazon eBay
272-97390ELECTRONIC MODULE1Service part / kit Amazon eBay
72557IGNITION COIL1Service part / kit Amazon eBay
72587COIL, IGNITION1Service part / kit Amazon eBay
A2666GASEOUS FUEL SOLENOID1Service part / kit Amazon eBay
A7097FUEL SOLENOID LP LIQUID1Service part / kit Amazon eBay

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Standby0.570.15
Standby2.460.65
Standby25%2.160.57
Standby50%3.00.79
Standby75%3.680.97
Standby100%4.261.13

Available documents

Spec sheet — 0171400SBY (Generac)Spec sheet — 0173000SBY (Generac)Reference — 0172950SBY (Generac)
Full service, cheapest listings

Priced items from this model's own parts manual.

Air filter 59402$18.00
Belt 199-A4531$89.99
Spark plug 275-A4531$22.57
3 priced items$130.56
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