Fire Mountain Sierra 3 Burner vs Fire Mountain Sierra 6 Burner
We compare the Fire Mountain Sierra 3 Burner and the Fire Mountain Sierra 6 Burner across every dimension that matters - our scores, the key specs, and how each performs on the things you will actually notice day to day.
At a glance
| Fire Mountain Sierra 3 Burner | Fire Mountain Sierra 6 Burner | |
|---|---|---|
| Our score | 9.5/10 | 9.3/10 |
| Best for | Regular garden barbecuing for family and guests | Regular garden barbecuing for family and guests |
| Not ideal for | Anyone short on storage space, or wanting charcoal flavour from a pure gas model | Anyone short on storage space, or wanting charcoal flavour from a pure gas model |
| Brand | Fire Mountain | Fire Mountain |
Specifications compared
| Fire Mountain Sierra 3 Burner | Fire Mountain Sierra 6 Burner | |
|---|---|---|
| Burners | 3 Built-in | 6 Gas |
| Grates | Cast iron Cooking surface | Cast iron Material stated |
Style and Setting
Fire Mountain Sierra 3 Burner
The gas barbecue is a built-in gas BBQ designed for outdoor garden and patio cooking, intended to sit within a larger outdoor kitchen setup rather than as a standalone unit. Its stainless steel body is made to integrate into both modern and traditional outdoor kitchen layouts, particularly where a fixed counter space is planned. The cooking area measures 50 x 42cm, positioning it for regular family meals rather than large gatherings. A lid thermometer is included to help judge grilling conditions without opening the lid frequently. The cooking grates are made from cast iron, and the product description does not provide details on maintenance requirements.
Fire Mountain Sierra 6 Burner
With the cooking capacity and grate material already set out in the key specifications, the next factor for this gas barbecue is how it fits different outdoor spaces and how that affects day-to-day use. The stated cooking area is 72 x 42cm, so it suits family-sized meals and wider cooking plans. Its XL outdoor format typically works best on garden patios, where there is enough room for movement around the grill. Cast iron grates typically feel substantial, yet they can demand careful cleaning to prevent residue build-up. In tighter balconies or narrow paths, placement and workflow may become awkward (not stated).
Size and Seating
Fire Mountain Sierra 3 Burner
With a cooking area measuring 50 x 42cm, the Fire Mountain is geared towards everyday grilling and smaller meal plans rather than very large batch cooking. It suits most casual patio use where cooking is done in smaller portions at a time, such as burgers, sausages and vegetables. The three burners divide cooking into separate zones, so different foods can be cooked at different rates. Seating is not determined by the unit itself and depends on outdoor space and table layout. For bigger groups, it may require multiple cooking rounds instead of one continuous cook.
Fire Mountain Sierra 6 Burner
The Fire Mountain is designed for larger outdoor cooking sessions, with a stated cooking area of 72 x 42cm (X-Large). Using six burners, it enables multiple items to be cooked at separate heat zones, which suits family-style meals and batch cooking. Seating capacity depends on the user's layout, as no specific table space or bench dimensions are provided. The grill's wide footprint can also demand additional patio clearance, so buyers should measure the available space before purchase.
Materials and Build
Fire Mountain Sierra 3 Burner
The gas barbecue uses a stainless steel body paired with cast iron grill grates, a practical combination for outdoor cooking as the grates retain heat while the stainless steel housing is designed to resist day-to-day weather exposure. The cast iron grates create stable cooking surfaces across the 50 x 42cm cooking area, and they are described as tolerating repeated heating cycles better than lighter metals. Stainless steel supports the garden-facing design, though it can show marks if cleaned roughly. A built-in thermometer is included in the lid.
Fire Mountain Sierra 6 Burner
Materials and build matter because a barbecue's heat performance and long-term maintenance depend on what parts are made and how they are assembled. The gas barbecue is described as an XL outdoor BBQ with a 72 x 42cm cooking area, using stainless steel as the main body material, and cast iron grill grates. Stainless steel typically resists rust better, so daily weather exposure is less of a worry. Cast iron holds heat well, but it is heavier and requires proper cleaning to prevent grease and residue build-up. Assembly relies on secure fastening, because loose parts can wear faster.
Comfort and Features
Fire Mountain Sierra 3 Burner
Comfort and Features on the Fire Mountain Sierra 3 Burner focus on day-to-day usability for outdoor cooking. The built-in design suits established garden patio setups, rather than frequent moving. A built-in thermometer on the lid allows users to monitor heat without repeatedly lifting the lid, which can slow cooking. The grilling surface is 50 x 42cm, making food planning straightforward for small groups. Grates provide solid support for pans and trays, though their weight can make deep cleaning slower. Controls and access are practical.
Fire Mountain Sierra 6 Burner
Comfort and features centre on how straightforward the Fire Mountain is to use day-to-day, and how the cooking layout supports family-sized meals. The XL cooking area is 72 x 42cm, making it easier to grill multiple items together. Cast iron grates are designed to make steady contact with the heat, and six burners allow cooking zones so different timings can be managed at the same time, such as larger cuts on one side and smaller items on the other. The cooking layout can feel busy in smaller outdoor spaces, and careful setup and spacing are important.
Who Is This For?
Fire Mountain Sierra 3 Burner
Who is the Fire Mountain for? It is intended for people who want a built-in outdoor gas barbecue for a garden or patio, offering a 50 x 42 cm cooking area. With three burners and a thermometer, it suits households that cook for several people and prefer temperature checking rather than guessing. Shoppers with limited outdoor space may find the built-in layout and 50 x 42 cm cooking area restrictive.
Fire Mountain Sierra 6 Burner
The gas barbecue suits families and groups who want to cook several items at once, rather than just a couple of portions. It is aimed at UK households with garden or patio space that can accommodate a large 72 x 42cm cooking area, where multiple trays, skewers, or sides can be cooked alongside mains. The six-burner layout is designed to support cooking by method. Cast iron grill grates are included to support steady searing. People cooking for small households may find the cooking area and burner layout unnecessary.
Fire Mountain Sierra 3 Burner: pros
- 3-burner
- Built-in
- Lid thermometer, cast iron grates
- Instant heat and quick cleanup versus charcoal
Cons
- Gas bottle, regulator and hose are usually sold separately
- Needs covering or storing over winter to prevent rust
- Check the assembled size suits your space
Fire Mountain Sierra 6 Burner: pros
- 6-burner
- Cast iron grates
- Instant heat and quick cleanup versus charcoal
Cons
- Gas bottle, regulator and hose are usually sold separately
- Needs covering or storing over winter to prevent rust
- Check the assembled size suits your space
Our verdict
Our pick is the Fire Mountain Sierra 3 Burner (our score 9.5/10) - A practical gas barbecue (3-burner) for outdoor cooking. The Fire Mountain Sierra 6 Burner is still worth it if it is cheaper when you check, or if it better matches your specific needs.