How to Install a 22kW Whole House Generator: Video Guide

Why a 22kW Generator Fits So Many Whole-House Backups

A 22kW air-cooled standby generator sits in a genuinely useful middle ground. It is large enough to carry the loads that actually matter during an outage — a central air conditioner, a furnace blower, a well pump, a sump pump, a refrigerator and freezer, network gear, lighting, and medical equipment — but it is still small enough to run on a residential natural gas meter or a modest propane tank.

Do the quick math and the number makes sense. At 240 volts, 22,000 watts of continuous output works out to roughly 91 amps. That is close to a 100-amp feeder, which is why most installs pair a 22kW unit with a 100A or 125A service-rated transfer switch rather than a 200A switch. If you have a 200-amp panel and want the option to run more later, a 200A service-rated switch is still a reasonable choice — you simply protect the generator feeder at the generator's rating.

Where 22kW shines is load management. A modern unit can run a 4- or 5-ton air conditioner with a soft-start kit, and it can handle larger loads in sequence using load-shedding modules. If you skip load management, you will either undersize the generator or spend the summer resetting breakers.

Smaller units — 10kW to 14kW — work well for the essentials-only crowd. Larger units in the 26kW to 32kW range make sense for all-electric homes with heat pumps, electric ranges, and EV charging. The 22kW class is the practical default for a typical gas-heated home with one large cooling load.

Planning Before You Buy Anything

The single biggest cause of a failed generator project is buying the unit before doing the planning. Work through these decisions in order.

Run a real load calculation

Start with a service-style load calculation, not a guess. List every load you want backed up, note the running watts and the starting watts, and apply the largest motor-starting surge once rather than adding all surges together. Common numbers to keep handy:

• Refrigerator: 700–800 running watts, 2,000+ starting watts
• Sump pump: 800–1,050 running watts, 2,000+ starting watts
• Furnace blower: 600–1,200 running watts
• 4-ton AC with soft start: 3,800–4,500 running watts
• Well pump: 1,000–2,000 running watts, 3,000+ starting watts
• Sump of electronics and lighting: 500–1,500 running watts

A 22kW unit comfortably covers a list like that with room for cycling. If your list includes electric resistance heat, an electric water heater, or EV charging, decide up front whether those are managed loads or excluded loads.

Choose the location carefully

Standby generators need breathing room. Most code frameworks require at least 5 feet of clearance from any opening in a building — windows, doors, dryer vents, and air intakes — plus manufacturer clearances on all sides, typically 18 to 36 inches for service access. In snow country, raise the unit above the expected snow line using a stand designed for it. Do not tuck it under a deck, against a bedroom window, or in a corner where exhaust can recirculate.

Also think about noise. A 22kW air-cooled unit runs in the low 60s dBA range at close distance during exercise, and louder under full load. Fencing can help, but only if it does not obstruct airflow.

Settle the fuel question early

Natural gas is usually the easiest path if the meter and service line can deliver the required volume. A 22kW generator under full load may draw roughly 200,000 to 250,000 BTU/hr, and that demand has to be available at the generator's inlet pressure — not just at the meter. Long runs, undersized pipe, or a shared line with a tankless water heater can starve the unit and cause nuisance shutdowns.

Propane offers independence from the gas utility, which matters in regions where a gas outage and a power outage happen together. Plan for a tank sized to run the generator for at least two to three days, and remember that propane tanks sweat and frost in cold weather, which reduces vaporization.

Either way, the final connection should be made by a licensed gas fitter who can size the line and pressure-test it.

Handle permits and inspections before the concrete

Most jurisdictions require a permit for a standby generator, transfer switch, and gas line. Some require a separate electrical permit and a mechanical or gas permit. Call the building department before you order equipment and ask three questions: What permits are required? What inspections are performed, and at what stages? Does the utility need to be notified or does the meter need to be pulled?

Getting this wrong is expensive. Inspectors routinely require corrections to grounding and bonding, clearance to openings, and pipe support — all of which are much cheaper to fix before the pad is poured.

A Video-First Workflow for Planning and Documenting the Install

Filming your install is not just content. It is a documentation tool, a compliance aid, and a memory aid for the next homeowner or technician who opens the panel. Treat it as part of the project, not an afterthought.

Previsualize with mockups and storyboards

Before anything is delivered, photograph the site from four angles and build a simple plan. You can drop the generator footprint and the transfer switch location into an image and check clearances visually. If you want to go further, generate a stylized mockup of the finished pad, unit, and conduit run — it is a fast way to spot problems like a downspout landing directly on the generator or a window where you thought there was a wall.

A short storyboard also helps if a helper or a licensed electrician is working with you. Sketch five frames: the pad, the conduit trench, the transfer switch mounted, the gas connection, and the finished install. That is the whole video in outline.

Build a shot list that matches the real order of work

Use this sequence. It keeps the footage usable and the safety order intact:

1. Wide establishing shot of the site before digging
2. Close-up of the markout and clearance measurements
3. Pad prep and compaction
4. Conduit and trench, before backfill
5. Transfer switch mounting and interior panel condition
6. Conductor routing and terminations, with the torque values visible
7. Gas line, sediment trap, and shutoff valve
8. Pressure test gauge while it holds
9. First start, exercise cycle, and transfer test
10. Final walkthrough with the cover on

Record the torque values on screen. Record the gas pressure reading on screen. Those two clips will save you an argument later with an inspector, a warranty tech, or a buyer.

AI-assisted editing that actually saves time

Long install footage is tedious to cut. Practical shortcuts that work well:

• Auto-transcription to create a searchable index of the footage, so you can jump to the moment you torqued the lugs
• Scene detection to split long clips into labeled chunks by tool or task
• Auto-captioning for silent viewing, which matters for how-to content
• Voiceover cleanup to remove wind and generator noise from narration
• Short vertical cutdowns for a load-test highlight or a clearance explainer

Keep a written log alongside the video: date, ambient temperature, gas pressure at the inlet, oil level, and the results of the transfer test. A video plus a log is far more useful than either alone.

Use the right gear without overcomplicating it

A phone on a small tripod, a cheap lavalier mic, and a headlamp are enough. Add one wide shot per stage and one close-up per critical connection. Avoid filming in the rain with the cover off, and never film while your hands are inside an energized panel.

Step 1: Preparing a Level, Vibration-Damped Base

The generator must sit on a stable, level surface. Out-of-level installation causes vibration, oil consumption, and premature bearing wear.

Pad options

• Poured concrete slab, typically 4 inches thick, reinforced, with the forms squared to the footprint plus service clearance
• Precast composite pad designed for the unit's weight
• Compacted crushed stone base with a composite pad on top, in areas where frost heave is a concern

Whichever you choose, dig below the frost line if local code requires it, and compact in lifts. Add drainage so water does not pool under the unit.

Anchoring and grounding

Anchor the unit with the manufacturer's specified hardware, and use seismic-rated anchors in earthquake zones. Connect the equipment grounding conductor to the generator's grounding lug per the manufacturer's instructions and the applicable electrical code. Do not create a second neutral-to-ground bond at the generator — the bond belongs at the service, and a duplicate bond will trip ground-fault protection and create shock hazards.

Film this stage. An inspector who can see the anchor spacing, the drainage slope, and the grounding lug in a 15-second clip will spend less time asking questions.

Step 2: Transfer Switch and Feeder Wiring

This is the part where DIY projects most often go wrong. If you are not experienced with service equipment, this stage belongs to a licensed electrician.

Where the switch goes

Mount the transfer switch near the main service panel, with working clearance in front. Decide early whether you are switching the whole service or a subpanel of backed-up circuits. Whole-service switching with a service-rated ATS is cleaner and easier to live with; a subpanel approach is cheaper but requires you to move circuits and can leave you with dark hallways.

Conductor sizing and routing

For a 22kW unit, plan a feeder protected at 100A or 125A. Conductor size depends on the material, termination temperature rating, and the code edition in force — copper in the 3 AWG range is typical for a 100A feeder, but verify with your electrician and the ampacity tables rather than copying a number from a forum. Undersized wire on a generator feeder causes voltage drop, nuisance trips, and heat.

Run conductors in conduit or armored cable as required, and leave a service loop at both ends. Label both ends of every conductor.

Neutral, grounding, and utility disconnect

In a typical service-rated transfer switch installation, the neutral is switched along with the hots, and the neutral-ground bond remains at the service. The generator's neutral must not be bonded again. Follow the transfer switch manufacturer's diagram exactly, and confirm whether the unit is a 2-pole or 3-pole switch configuration.

Coordinate the utility disconnect. Many utilities want the meter pulled or a visible means of disconnect before they will reconnect. Ask before the day of the install.

Step 3: Fuel Line Hookup and Leak Testing

Gas work is not a place to improvise.

Pipe sizing and materials

Size the line for the generator's full-load demand plus any other appliances sharing that run. Use approved pipe dope or tape for the fuel type, install a sediment trap ahead of the generator's regulator, and support the pipe properly.

Shutoff, regulator, and flexible connection

Install a manual shutoff within sight of the generator. For propane, add a regulator sized for the unit's demand and the tank pressure. Use an approved flexible connector to absorb vibration, and make sure it does not rub against anything.

Pressure test and purge

Cap the line, pressurize it with air or nitrogen to the pressure your jurisdiction requires, and hold it for the full test duration. Record the gauge on video. Then purge the line of air before first start, following the manufacturer's procedure.

If you smell gas at any point, stop, shut off the source, and ventilate. Do not chase a leak by tightening a fitting under pressure.

Step 4: Commissioning, Load Testing, and Safety Verification

First start and check-out

After the gas fitter and electrician sign off, verify oil level, coolant (if applicable), battery connections, and that all breakers are in the correct position. Start the unit in manual mode and let it run unloaded for several minutes. Listen for unusual noise and watch for exhaust leaks.

Transfer and re-transfer test

Simulate an outage by opening the utility disconnect. The generator should start, stabilize, and transfer within the designed delay. Then close the disconnect and confirm the unit re-transfers and shuts down after its cool-down cycle.

Load testing

Apply load in stages rather than all at once. Turn on the largest HVAC load first, then add the rest. Watch frequency and voltage stability as each load comes online. If the unit stumbles or drops out, you likely have a fuel supply problem or a load management issue — not a generator defect.

Document everything

Film the transfer test, record the running hours, note inlet gas pressure at full load, and write down the torque values you used. Keep the manual, the permit, and the inspection sign-off in one place.

Maintenance, Monitoring, and Smart Features

The exercise cycle

Weekly exercise runs keep seals lubricated and batteries charged. Set the exercise time for a moment when noise is least disruptive. If the unit exercises at night, your neighbors will notice.

Routine service intervals

Change oil and filter based on hours or the manufacturer's interval, inspect spark plugs, check the air filter, and test the battery. Keep a spare battery maintainer on hand. Before storm season, do a full visual inspection of the gas line, conduit, and clearances.

Monitoring and alerts

Modern standby units can push status alerts to a phone: run hours, battery voltage, fault codes, and maintenance reminders. Enabling these notifications turns a surprise failure into a scheduled service visit. If your model supports remote diagnostics, use it — a technician can often resolve a fault without a truck roll.

Mistakes That Turn a Weekend Project Into a Nightmare

1. Buying the generator before sizing the load and confirming gas capacity
2. Pouring a pad without checking clearance to windows, vents, and doors
3. Running undersized conductors or skipping a service-rated transfer switch
4. Creating a second neutral-ground bond at the generator
5. Testing the gas line visually instead of with a pressure gauge
6. Starting the unit with air still in the fuel line
7. Skipping the permit because "it's just a generator"
8. Leaving no service access on the sides of the unit

Each of these is easy to prevent with ten minutes of planning and much harder to fix after the fact.

FAQ

Can I install a 22kW generator myself?

You can often handle site prep, the pad, conduit runs, and documentation. Electrical terminations inside a service-rated transfer switch and any gas line work should be done by licensed trades. Many jurisdictions will not pass an inspection on owner-installed service equipment.

What size transfer switch do I need for a 22kW unit?

A 100A or 125A service-rated switch is typical. A 200A switch is acceptable if you want headroom, but the generator feeder still has to be protected at the generator's rating.

Natural gas or propane — which is better?

Natural gas is usually cheaper and requires no tank management, if your service can deliver the required volume at the right pressure. Propane gives you independence when the gas utility is also affected, and it stores well, but it needs a properly sized tank and regulator.

How far should the generator be from the house?

A five-foot minimum from openings is a common requirement, plus manufacturer clearances for service and airflow. Always confirm the specific rule with your local building department.

How long does installation take?

Site prep and the pad are often a one-day job. Electrical and gas work typically add one to three days depending on the run lengths. Inspection scheduling often adds the longest delay.

Why should I film the installation?

Video documentation proves torque values, gas pressure, and clearances, which speeds up inspections and warranty claims. It also gives the next owner or technician a clear record of how the system was built.

Wrapping Up

A 22kW whole-house generator is one of the few home improvements that pays off the first time the grid goes down. The install rewards planning: calculate the load honestly, place the unit with clearance to spare, size the fuel line for full demand, respect the grounding rules, and test under real load before you call it finished. Document the work as you go — with a camera and a written log — and both the inspection and every future service visit become simpler.