Photo may vary slightly — verify by model number before ordering.LG KUSXB181A 18,000 BTU Single-Zone Universal Heat Pump Outdoor Unit, R32
In stock and ordered before 1pm ET, Mon–Fri? It ships the same day from our US warehouse.
Not sure it's the right unit? Send the model and serial — help@totalhvacparts.com or 302-219-4994.
Need more than 6? Ask about factory lead time — we'll give you a real date, not a guess.
Min. order: 1 unit · Weight: 154.3 lb · Truck Freight
Overview
LG KUSXB181A is a 18,000 BTU class R32 Single-Zone Universal inverter heat pump outdoor unit for LG's single-zone ducted, cassette, console and air-handler systems. LG rates it with the following indoor units: KNUFB181A, KNUDB181A, KNUJB181A, KNSLB181A (see Companion Units below for the matching system bundles). Rated 7,200 / 18,000 / 23,000 Btu/h cooling and 7,000 / 19,000 / 24,000 Btu/h heating (min / rated / max). It replaces the R-410A LUU180HV.
136 lb net, 208-230V power, 16.0 A MCA / 25 A MOP, 48 dB(A) sound pressure in cooling, heating operation down to -4°F outdoor, 14,600 Btu/h available at 5°F.
Pairing and installation
- Indoor unit: LG KNUFB181A, LG KNUDB181A, LG KNUJB181A, LG KNSLB181A — one head per system.
- Refrigerant: R32 (A2L) — installation by a licensed contractor following the LG R32 installation manual and local code.
- Electrical: 208-230V, 16.0 A MCA, 25 A MOP; disconnect and breaker field supplied.
Installation and warranty registration by an LG-trained licensed contractor — current terms are in the LG limited warranty document under Documentation.
Compatible Units
LG approves KUSXB181A only in the combinations below (per the LG engineering manual and submittal). Mixing it with any other outdoor or indoor unit is not an AHRI-rated match. Ask the parts desk if your existing equipment isn't listed.
- KNUFB181A (indoor unit)
- KNUDB181A (indoor unit)
- KNUJB181A (indoor unit)
- KNSLB181A (indoor unit)
- KSUFB181A (system)
- KSUDB181A (system)
- KSUJB181A (system)
- KSSLB181A (system)
Specifications
Values in italic are not yet confirmed from OEM documentation. Ask us to verify before ordering.
Documentation
Companion Units & System Bundle
| Model | Description | Stock | ||
|---|---|---|---|---|
 |
KNUFB181ALG · Compatible indoor unit | KNUFB181A 18,000 BTU 1-Way Ceiling Cassette indoor unit | ✓ In stock | View |
 |
KSUFB181ALG · Complete system | KSUFB181A bundle: KNUFB181A indoor unit + this outdoor unit | ✓ In stock | View |
 |
KNUDB181ALG · Compatible indoor unit | KNUDB181A 18,000 BTU 4-Way Ceiling Cassette indoor unit | ✓ In stock | View |
 |
KSUDB181ALG · Complete system | KSUDB181A bundle: KNUDB181A indoor unit + this outdoor unit | ✓ In stock | View |
 |
KNUJB181ALG · Compatible indoor unit | KNUJB181A 18,000 BTU Mid-Static Ducted indoor unit | ✓ In stock | View |
 |
KSUJB181ALG · Complete system | KSUJB181A bundle: KNUJB181A indoor unit + this outdoor unit | ✓ In stock | View |
 |
KNSLB181ALG · Compatible indoor unit | KNSLB181A 18,000 BTU High Efficiency Multi-Position Air Handler indoor unit | ✓ In stock | View |
 |
KSSLB181ALG · Complete system | KSSLB181A bundle: KNSLB181A indoor unit + this outdoor unit | ✓ In stock | View |
After You Order
Order number and confirmation by email the moment you check out.
Pulled from our shelf — the same live count you saw on this page. In-stock orders placed before 1pm ET, Mon–Fri, leave the same business day.
Tracking number lands in your inbox the moment it leaves the building.
Check the part number on the label against your order before installing. Wrong or damaged? Tell us — we'll sort it out.
Ask the Parts Desk
Not sure this fits? Need more than what's in stock? Send the model and serial from the unit's data plate — a real person reads it and confirms before you order.
Common Questions
What does the LG KUSXB181A pair with?
LG rates KUSXB181A only with KNUFB181A (indoor unit) or KNUDB181A (indoor unit) or KNUJB181A (indoor unit) or KNSLB181A (indoor unit) or KSUFB181A (system) or KSUDB181A (system) or KSUJB181A (system) or KSSLB181A (system). Other combinations are not AHRI-matched and are not covered by the LG warranty.
What does the KUSXB181A replace?
KUSXB181A is LG's current R32 model in this position and replaces the discontinued LUU180HV. R32 and R-410A equipment cannot be mixed — replace the indoor and outdoor unit together.
What power does the KUSXB181A need?
208-230V, 1-phase. Minimum circuit ampacity and maximum overcurrent protection are listed in the Specifications table above and on the LG submittal under Documentation; size the breaker and wire to those values and local code.
Is the submittal sheet and installation manual available for KUSXB181A?
Yes — the LG submittal data sheet, engineering manual, installation manual and warranty document are all linked under Documentation on this page and can be downloaded without an account.
Is the stock number on this page real?
Yes — it's the live count from our own shelf, not an availability estimate. If it says 6, that's how many are physically here. When it hits zero, this page says so.
Is this a genuine LG unit, or aftermarket?
Genuine LG OEM equipment — not an aftermarket substitute.
I see this listed under a different name on other sites. Is it the same part?
Yes — manufacturers and distributors sometimes use different brand names or legacy labels for the same part number. Part number KUSXB181A is identical across all name variations.
What's the warranty on this part?
Warranty terms vary by manufacturer. Contact us with your order number for details specific to this part.
How fast does this ship?
In-stock items ship the same business day on orders placed before 1pm ET, Monday–Friday. Standard ground delivers to most of the continental US in 2–5 business days. This part ships by LTL freight, so transit runs on the freight schedule — we'll contact you to arrange delivery.
Does everything ship UPS or FedEx Ground?
This part ships by truck freight rather than parcel — still free, included in the price shown, and we'll contact you to schedule delivery before it ships.Most orders ship UPS or FedEx Ground. A small number of large or heavy parts across the catalog ship by truck freight instead — that's still free, and we reach out to arrange a delivery window before those orders leave the warehouse.
