Choosing the right stairlift starts with your staircase, where the lift will be installed, and the person who will use it.
For example, a straight indoor staircase may be compatible with a Pinnacle or Summit stairlift, while a staircase with curves, turns, or intermediate landings requires a curved stairlift solution. Outdoor staircases require models designed for exposure to the elements, and users who need additional capacity or seating space may need a heavy-duty stairlift.
To narrow your options, start with five questions:
- Is your staircase straight or curved?
- Will the stairlift be installed indoors or outdoors?
- What weight capacity does the user need?
- How much space is available on the staircase?
- Which comfort, transfer, and convenience features would make the lift easier to use?
The comparison below explains the differences among Harmar stairlift options and the features to consider before choosing a model.
Which Harmar Stairlift Do I Need?
The shape and location of your staircase will narrow your options considerably.
| Your Need | Stairlift Type to Consider |
| Straight indoor staircase | Pinnacle or Summit indoor straight stairlift |
| Straight outdoor staircase | Outdoor-rated straight stairlift |
| Curved staircase or staircase with turns | Curved stairlift |
| Multiple landings or changes in direction | Curved stairlift |
| Higher weight capacity | Heavy-duty stairlift |
| Narrow staircase | Compact stairlift with a narrow folded profile |
| Doorway or walkway near the bottom step | Stairlift compatible with a folding rail |
A stairlift dealer should assess both the staircase and the person who will use the lift before recommending a specific model.
What Is the Difference Between a Straight and Curved Stairlift?
A straight stairlift travels along a straight rail, while a curved stairlift follows a rail configured specifically for a staircase with turns, curves, intermediate landings, or changes in direction.
Straight stairlifts are generally simpler to configure and install because the rail does not need to follow turns in the staircase.
Curved stairlifts require more detailed measurements because the rail must follow the shape, angle, and direction of the stairs.
The staircase—not simply personal preference—usually determines whether you need a straight or curved model.
Harmar Pinnacle Stairlifts: Premium Straight-Stair Solutions
The Harmar Pinnacle family is designed for straight staircases and includes models for different user needs, weight capacities, and staircase configurations.
Pinnacle SL600
The Pinnacle SL600 is Harmar’s premium straight stairlift and is designed for users who want a compact lift with comfort, safety, and convenience features.
The SL600 has a 350-pound weight capacity and folds to approximately 10.5 inches from the wall, making it particularly useful when preserving staircase space is important.
Features include:
- 350-pound weight capacity
- Retractable seat belt
- Swivel seat with interlock
- Footrest and chassis obstruction sensors
- Call/send controls
- Battery-powered operation during a power outage
- Nylon polymer gear rack that does not require grease or lubrication
- Optional automatic folding rail
- Optional key lock
The SL600 may be a good fit for: someone with a straight indoor staircase who wants a compact, premium stairlift with additional convenience features.
Pinnacle SL600HD
The Pinnacle SL600HD is Harmar’s heavy-duty straight stairlift.
It is designed for users who require greater weight capacity and additional seating space than a standard stairlift provides.
The SL600HD supports users weighing up to 600 pounds.
The SL600HD may be a good fit for: someone who needs a straight stairlift with higher weight capacity, a larger seat, or additional room between the armrests.
Pinnacle SL300
The Pinnacle SL300 provides a more streamlined option for straight indoor staircases.
It shares the Pinnacle family’s clean, low-maintenance drive design while focusing on the core features needed for everyday stairlift use.
The SL300 may be a good fit for: someone with a straightforward indoor staircase who needs dependable seated access without some of the premium features available on the SL600.
Harmar Summit Stairlifts: Straightforward Indoor and Outdoor Access
The Summit family includes stairlifts designed for straight staircases, with options for both indoor and outdoor applications.
Summit SL350AC
The Summit SL350AC is an AC-powered stairlift designed for straight indoor staircases.
Unlike Harmar’s battery-powered Pinnacle models, the SL350AC operates using household electrical power.
The SL350AC may be a good fit for: someone looking for a straightforward stairlift solution for a straight indoor staircase where continuous AC power is appropriate.
Summit SL350OD
The Summit SL350OD is designed specifically for straight outdoor staircases.
Outdoor stairlifts must withstand conditions that indoor models are not designed for, including changing temperatures, moisture, and other environmental exposure.
The SL350OD may be a good fit for: someone who needs seated access along a straight exterior staircase, such as stairs leading to a porch, deck, or entrance.
Harmar Curved Stairlifts
If a staircase has turns, curves, intermediate landings, spirals, or changes in direction, a curved stairlift is generally required.
Unlike a standard straight rail, a curved stairlift rail is configured to follow the shape of the staircase.
Harmar offers multiple curved-staircase solutions, allowing a dealer to recommend a system based on the staircase layout, installation needs, user preferences, and available features.
Helix Curved Stairlift
The Helix Curved Stairlift uses a custom-fabricated rail designed specifically for the staircase.
A custom rail can accommodate complex staircase configurations while following the shape and angle of the stairs.
The Helix may be a good fit for: homes with curved, turning, or multi-landing staircases that require a custom-fabricated rail.
Modular Curved Stairlift Options
Harmar also offers modular curved stairlift solutions: the Otolift Modul-Air Curved Stairlift and the UP Stairlift.
Rather than fabricating one custom rail for the entire staircase, modular systems use rail components that are configured to match the staircase.
Depending on the application, a modular curved stairlift may provide a faster path from measurement to installation than a fully custom-fabricated system.
A Harmar dealer can compare custom and modular curved options and determine which approach is appropriate for your staircase.
Which Harmar Stairlift Has the Highest Weight Capacity?
The Pinnacle SL600HD has a weight capacity of up to 600 pounds, making it Harmar’s heavy-duty straight stairlift option.
However, weight capacity should not be the only consideration when choosing a stairlift.
The user should also have adequate:
- Seat width and depth
- Space between the armrests
- Footrest space
- Headroom
- Knee clearance
- Space to transfer safely onto and off the chair
A professional assessment can help determine whether a particular stairlift fits the user’s body dimensions and transfer needs—not simply their weight.
Which Harmar Stairlift Is Best for a Narrow Staircase?
For a straight staircase where space is limited, the Pinnacle SL600 is designed to fold to approximately 10.5 inches from the wall when the seat and footrest are folded.
A narrow folded profile leaves more room for other household members to use the stairs when the stairlift is parked.
However, folded width is only one measurement that matters. The dealer should also evaluate:
- Overall staircase width
- User position while riding
- Knee and foot clearance
- Handrails
- Doorways
- Upper and lower landings
- Space needed to swivel and transfer
A professional staircase assessment is the best way to determine whether a stairlift can be safely installed on a narrow staircase.
Which Stairlift Is Best for Outdoor Stairs?
An outdoor-rated stairlift should be used for exterior stairs.
Outdoor stairlifts are designed with components and protective features appropriate for exposure to environmental conditions.
For a straight outdoor staircase, Harmar offers the Summit SL350OD.
Curved outdoor staircases require a curved stairlift rated and configured for outdoor use. A dealer can determine which current Harmar curved option is appropriate for the staircase and environment.
An indoor stairlift should not simply be installed outside.
What Stairlift Features Should You Compare?
Once you’ve determined which models are compatible with the staircase, compare the features that affect how comfortably and safely the user can operate the lift.
Seat and Swivel
The stairlift seat carries the user between floors.
A swivel seat allows the chair to turn at the upper landing so the user can enter or exit while facing away from the staircase.
When comparing models, consider:
- Seat width and depth
- Backrest design
- Armrest spacing
- Manual or powered swivel options
- Upholstery
- How easily the user can transfer onto and off the seat
Folding Seat, Armrests, and Footrest
Folding components reduce the stairlift’s footprint when it is not being used.
This can be especially important when other people regularly use the staircase.
Depending on the model, some folding functions may be manual while others may offer powered or automatic options.
Seat Belt
A seat belt helps keep the user securely positioned while the stairlift is moving.
Some Harmar stairlifts include a retractable seat belt as standard equipment, while features vary by model.
Ask your dealer which seat-belt design comes with the stairlift you’re considering.
Call/Send Controls
Call/send controls allow the empty stairlift to be moved to the opposite end of the staircase.
This is particularly helpful when more than one person uses the lift or when the chair has been left on another floor.
Folding Rail
A stairlift rail may extend into a hallway, doorway, or walkway at the bottom of the staircase.
A folding rail allows the lower section to move out of the way when the stairlift is not traveling over it.
Harmar offers an automatic folding-rail option on compatible straight stairlifts.
Obstruction Sensors
Obstruction sensors are designed to stop the stairlift if the footrest or chassis encounters an object while the lift is moving.
These sensors are an important safety feature, particularly in homes with pets or frequently used staircases.
Battery Backup
Many stairlifts use batteries that remain charged while the lift is connected to household power.
Battery operation can allow the stairlift to continue working temporarily during a household power outage.
The number of trips available depends on the stairlift model, battery condition, rail length, user weight, and other factors.
How Do I Choose Between Harmar Stairlift Models?
Start with the staircase, then consider the user.
Ask these questions in order:
1. Is the staircase straight or curved?
This determines the basic rail and stairlift type.
2. Is the staircase indoors or outdoors?
Outdoor applications require an appropriately rated model.
3. What weight capacity and seat dimensions are needed?
Choose a model that accommodates both the user’s weight and body dimensions.
4. Can the user safely transfer onto and off the chair?
Consider seat height, swivel functionality, footrest position, landing space, balance, strength, and whether assistance will be available.
5. How much staircase space is available?
Measure the staircase, landings, nearby doorways, and other potential obstructions.
6. Which features would make the stairlift easier to use?
Consider folding rails, call/send controls, powered features, seat-belt design, and other available options.
A local Harmar dealer can assess the staircase and user needs and recommend compatible stairlift models.
Harmar Stairlift Comparison at a Glance
| Model/Family | Staircase | Location | Best Suited For |
| Pinnacle SL600 | Straight | Indoor | Premium features and compact folded profile |
| Pinnacle SL600HD | Straight | Indoor | Higher weight capacity and additional seating space |
| Pinnacle SL300 | Straight | Indoor | Streamlined everyday stairlift |
| Summit SL350AC | Straight | Indoor | Straightforward AC-powered access |
| Summit SL350OD | Straight | Outdoor | Exterior straight staircases |
| Helix | Curved | Indoor/compatible applications | Custom curved or multi-landing staircases |
| Modular curved options | Curved | Varies by model | Curved staircases where a modular rail system is appropriate |
Product specifications, options, and availability can change. A Harmar dealer can confirm current models and determine which stairlift is compatible with the staircase and user’s needs.
Find the Right Stairlift for Your Home
There isn’t one Harmar stairlift that’s best for every home.
The right model depends on the shape of the staircase, installation environment, available space, user weight and dimensions, transfer ability, and preferred features.
If your staircase is straight, compare Harmar’s Pinnacle and Summit options based on capacity, features, indoor or outdoor placement, and available space.
If your staircase curves, turns, or includes intermediate landings, a Harmar dealer can evaluate custom and modular curved stairlift options.
A professional stairlift assessment can help identify which models fit both your home and the person who will use the lift.
Frequently Asked Questions About Harmar Stairlifts
What is the best Harmar stairlift?
There is no single best stairlift for every user. The right Harmar stairlift depends on whether the staircase is straight or curved, indoor or outdoor, required weight capacity, available space, transfer needs, and preferred features.
What is the difference between the Pinnacle SL300 and SL600?
Both are designed for straight indoor staircases, but the SL600 is Harmar’s premium Pinnacle model and includes additional comfort and convenience features. The SL300 provides a more streamlined option for users who don’t require all of the SL600’s features.
Which Harmar stairlift holds the most weight?
The Pinnacle SL600HD has a weight capacity of up to 600 pounds. Seat dimensions, transfer space, and user fit should also be considered when selecting a heavy-duty stairlift.
Does Harmar make stairlifts for curved stairs?
Yes. Harmar offers curved stairlift solutions for staircases with turns, curves, intermediate landings, and other configurations.
Does Harmar make an outdoor stairlift?
Yes. Harmar offers stairlifts designed for outdoor applications, including the Summit SL350OD for straight exterior staircases.
Can a stairlift work during a power outage?
Battery-powered stairlifts can continue operating for a limited period during a household power outage when the batteries are adequately charged. Exact performance varies by model, battery condition, rail length, load, and other factors.
How do I know which stairlift will fit my staircase?
A stairlift dealer should measure the staircase and landings and evaluate the user before recommending a model. Staircase shape, width, incline, available clearance, nearby doorways, and transfer space can all affect compatibility.
Are You Ready to Learn More?
Interested in learning about which stairlift might be best for you and your needs? Visit out Dealer Locator to find a certified Harmar dealer in your area for a free consultation today!
