Quick Comparison
| Product | Best For | Rating |
|---|---|---|
| LG WM4000HWA Stack Kit | Best Overall | 4.7/5 |
| GE GFW148SSMWW | Best Budget | 4.6/5 |
| Samsung WF45R6100AW | Best Premium | 4.7/5 |
| Bosch 300 Series Compact | Best for Apartments | 4.5/5 |
| Whirlpool WFW5605MW | Best Compact | 4.6/5 |
I have installed stackable laundry in three apartments over 8 years - studio in NYC, one-bedroom in Boston, and now a townhouse with a dedicated laundry closet. The planning details that matter most.
Sizing
Standard stacked: 27 x 30 x 76 inches (typical). Both washer and dryer are 27 x 30 inches. The dryer stacks on top.
Compact stacked: 24 x 25 x 70 inches. Specifically designed for apartment closets and tight spaces. Smaller capacity than standard.
Combo unit (single appliance): 27 x 30 x 33 inches typically. Washer-dryer combined in one drum. Fits in counter-height cabinet.
Space needed:
- Standard stack: 30+ inch wide closet, 30+ inch deep, 76-78 inches tall (plus clearance)
- Compact stack: 25-27 inch wide closet, 28+ inch deep, 70-72 inches tall
- Plus 4-6 inches behind for plumbing/electric/venting
- 1 inch sides clearance
Check actual model dimensions - “compact” varies by brand.
Capacity Comparison
Standard stacked: 4-4.5 cubic foot washer, 7-7.5 cubic foot dryer. Handles family-size loads.
Compact stacked: 2.5-3 cubic foot washer, 4-4.5 cubic foot dryer. Handles couple-size loads. Larger items (king comforter) may not fit.
For family of 4+: standard stack. For couples or singles in small spaces: compact stack.
Electric vs Gas Dryer
Gas dryer:
- Requires gas line (additionalcurrent pricing if not present)
- Requires 120V electric outlet (most stack closets have this)
- Faster drying (35-50 min typical load)
- Lower per-cycle operating cost
- More expensive purchase
Electric dryer (vented):
- Requires 240V dedicated outlet
- Standard for most apartments
- Slower than gas (40-55 min)
- Higher operating cost per cycle
- Less expensive purchase
Electric dryer (ventless heat pump):
- Requires only standard 120V outlet
- Slowest drying (60-90 min per load)
- Most energy efficient (50% less than vented electric)
- Most expensive purchase
- No external vent needed
Ventilation
Vented dryers need external vent through wall to outside. Maximum vent length: 25-35 feet per code (varies). 4-inch diameter rigid metal duct preferred over flexible.
Ventless dryers work in any room without external vent. Condenser dryers collect water in internal reservoir or drain to sink. Heat pump dryers recirculate air after dehumidifying.
For apartments without existing vent, ventless dryer eliminates major installation cost ( for venting installation if possible at all).
Plumbing and Electric
Washer requirements:
- Hot and cold water supply (1/2 inch standard)
- Drain (1.5-2 inch typical)
- 120V electric outlet
Vented electric dryer:
- 240V/30A dedicated outlet
- 4 inch external vent
Gas dryer:
- Gas line with shut-off
- 120V outlet
Heat pump dryer:
- 120V outlet
- Drain or reservoir (some models)
If your closet doesn’t have these, professional installation is required. Cost variescurrent pricing for adding plumbing/electric/venting to spaces without them.
Stacking Installation
Stack kit requirements:
- Brand-specific kit (GE on GE, LG on LG, etc.)
- Matched washer/dryer pair (some kits work across brands; most don’t)
- Two-person installation
- Earthquake bracket (where required by code)
Process:
- Position washer first (level, secured)
- Attach stack brackets to washer top
- Lift dryer onto washer (heavy - 2 people)
- Secure dryer to brackets
- Connect water, electric, vent
- Test full cycle
DIY installation possible but professional installation is safer for the lift step. Two-story or stairs increase cost.
Apartment Considerations
Renter’s restrictions: Many apartments don’t allow washers/dryers due to plumbing capacity and water damage liability. Verify lease before purchase.
HOA restrictions: Condos often regulate washer/dryer installation. Verify approval before purchase.
Insurance: Washer leaks cause major damage. Verify renter’s or homeowner’s insurance covers washer-related water damage.
Sound: Spin cycles produce significant noise. Place in spaces where noise won’t disturb neighbors. Some buildings restrict laundry hours.
Brand Recommendations
Premium: LG, Samsung. Premium quiet operation, advanced features (smart home integration, customizable cycles), 10-year warranties on motor.
Mid-tier: GE, Whirlpool, Bosch. Reliable performance, fewer premium features, 5-10 year warranties.
Budget: Kenmore, Maytag basic models. Functional but more frequent service issues over time.
Compact specialists: Bosch (highly regarded for compact units), LG WashTower (integrated washer/dryer unit), Miele (European compact specialist).
Cost Estimates
Stacked pair purchase:
- Standard: for pair
- Compact: for pair
- Premium compact:
Stack kit: for matching brand kit
Installation:
- If existing hookups: for stack and connect
- If new electric/plumbing:
- If new venting:
- Gas line installation:
Total: for typical apartment installation.
My Experience
Installation 1 (NYC studio): Compact LG stacked pair, electric heat pump dryer. No vent needed. Total: + install. Quiet, slow drying, fit perfectly in 24-inch closet.
Installation 2 (Boston 1-bed): Standard Whirlpool stacked pair, vented electric dryer. Existing hookups. Total: + install. Faster drying, better capacity, slightly louder.
Installation 3 (townhouse, current): Standard LG stacked pair, gas dryer. Existing gas line. Total: + install. Fast drying, low operating cost.
The compact ventless setup was most flexible but slowest. The standard gas setup is fastest but required gas line. Match the system to the space and use frequency.
Frequently asked questions
Stackable vs all-in-one washer dryer combo?+
Stackable (two separate units) faster wash and dry, easier to repair, longer lifespan. All-in-one combos wash and dry in one drum but take 3-5x longer to dry. Stackable is better for daily use; all-in-one suits limited-space apartments with infrequent laundry.
Vented or ventless dryer?+
Vented dryers (gas or electric) require external vent through wall. Faster drying but require duct installation. Ventless (heat pump or condenser) work in any room without vents. Slower (60-90 min vs 35-45 min vertical) but flexible placement. Modern heat pump dryers are 50% more efficient than vented.
What space do I need?+
Standard stacked: 27 inches wide x 30 inches deep x 76 inches tall. Compact stacked: 24 inches wide x 25 inches deep x 70 inches tall. Plus 6 inches clearance behind for venting and hookups, 1 inch clearance on sides.
Electric or gas dryer?+
Gas dryers are faster and cheaper to operate (depending on local utility costs). Electric requires only outlet. Gas requires gas line plus electric. For new installation, gas if convenient. For replacement, match existing setup.
How do I stack two machines?+
Manufacturer-specific stacking kits provide brackets that secure dryer on top of washer. Must use the matched stacking kit - generic universal stack kits aren't safe. Two-person installation. Most kits include earthquake brackets.