Fire Mountain Sierra 3 Burner vs Fire Mountain Sierra 4 Burner
We compare the Fire Mountain Sierra 3 Burner and the Fire Mountain Sierra 4 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 4 Burner | |
|---|---|---|
| Our score | 9.5/10 | 9.4/10 |
| 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 4 Burner | |
|---|---|---|
| Burners | 3 Built-in | Four burners Quantity stated |
| Grates | Cast iron Cooking surface | Cast iron Type 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 4 Burner
With the key specifications in mind, this gas barbecue is designed to suit a family-size outdoor grilling setup, including space for a main cooking area of 60 x 42cm and side shelves for food prep. Its stainless steel build is intended to provide a clean, modern appearance in UK gardens, patios and outdoor kitchens. Four burners support different cooking approaches, while the overall layout depends on leaving adequate clearance around the unit. The grill grates are cast iron, which is typically associated with good heat contact for everyday grilling, but they do require careful cleaning to avoid a build-up that can affect performance. This is a gas barbecue (LPG/propane), and the side burner is a separate burner with a pan ring rather than additional grill space. Outdoor use only is essential: keep the barbecue away from anything flammable, use it in open air, and turn off the gas supply at the bottle after use. Grease build-up can lead to flare-ups, so regular cleaning is important. Covering and storing the unit over winter helps prevent rust.
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 4 Burner
The Fire Mountain is designed for family-sized grilling, with a main cooking area that measures 60 x 42cm. In practical terms, that cooking footprint allows larger cuts to be arranged without immediate overcrowding, and it supports planning multiple items across the available space. The seating capacity is influenced more by the chosen cooking pattern than by the grill footprint alone, because diners may want different foods at the same time. It can serve several people, while very large gatherings may still require extra cooking rounds.
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 4 Burner
The gas barbecue's Sierra 4 Burner uses stainless steel as the main body material, and it includes cast iron grates for the cooking surface, which can help with heat retention during grilling. The stainless steel frame is designed for routine outdoor weathering. Cast iron grates typically provide solid searing and more even hot spots, but they may also be heavier and require careful cleaning to prevent residue build-up.
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 4 Burner
Comfort and Features focuses on the day-to-day grilling tasks the Sierra 4 Burner is set up for in a family-sized layout. The cooking area measures 60 x 42cm, which allows multiple portions to be cooked at once without feeling cramped. Four gas burners provide flexible control for different heat levels, and cast iron grill grates offer a stable cooking surface suitable for regular use. Side shelves add practical workspace for prepping food and keeping items close to the grilling zone.
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 4 Burner
This BBQ suits people who want a family-sized outdoor grilling setup, with a 60 x 42cm cooking area and four main gas burners for everyday meals. It is aimed at households that regularly cook outside, and it benefits from side shelves that provide additional prep space. The stainless steel body is designed for solid day-to-day use. It is less suitable for small balconies because its overall size is not described as compact.
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 4 Burner: pros
- 4-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 4 Burner is still worth it if it is cheaper when you check, or if it better matches your specific needs.