Choosing the right fireplace insert is the key to efficient heating, firewood savings, and safety. Many buyers, when choosing a fireplace for their home or cottage, make common mistakes that later come at a high cost. In this article, we’ll cover the top three mistakes when purchasing a fireplace insert and explain how to avoid them. We’ll also focus on SAVEN steel fireplace inserts — a modern solution for comfortable home heating.
1. Choosing an insert without considering the heating area
One of the most frequent mistakes is buying a fireplace insert without considering the area to be heated. This leads either to overheating the room or insufficient warmth, where the fireplace operates at its limit.
Why is this important?
Each insert has its own heat output, designed for a certain area. If you choose an insert “by eye,” you may not only lose comfort but also shorten the lifespan of the unit.
How to avoid this mistake:
Calculate the required heat output using the formula: 1 kW per 10 m² for a standard insulated house.
Consider the quality of insulation, number of windows, and ceiling height.
Choose SAVEN steel fireplace inserts based on area — the product range includes models with 14, 17, and more kW.
2. Incorrect selection of ventilation grilles
Another critical mistake is ignoring or incorrectly installing ventilation grilles for distributing warm air. Without them, the fireplace cannot effectively release heat, and the cladding may overheat.
Why are ventilation grilles needed?
They ensure natural or forced convection of hot air from the fireplace cladding into the room. This not only improves efficiency but also increases the fireplace efficiency (efficiency ratio).
Common mistakes:
- Grilles that are too small.
- Incorrect placement (too low or too high).
- No exhaust grilles at all.
How to do it right:
- Use ventilation grilles for fireplaces made of heat-resistant materials.
- Place supply grilles at the bottom, exhaust grilles at the top.
- Choose the grille size according to the power of the insert: the more powerful the insert, the larger the total area of openings should be.
If the grilles need to stay discreet in the interior, look at the LOFT series, LOFT ANGLE for the corners of the surround, and HIDE; classic framed models are gathered in the CLASSIC series.
SAVEN steel fireplace inserts pair perfectly with air distribution systems — be sure to consult a specialist when selecting grilles.
3. Incorrect flue diameter
The chimney flue acts as the "lungs" of the fireplace. Choosing the wrong diameter may lead to poor draft, smoke leakage, excessive condensation, and even the risk of carbon monoxide poisoning.
Main problems caused by an incorrect flue:
- Smoke returns into the room.
- The fireplace goes out after ignition.
- Excessive soot buildup occurs.
How to avoid this mistake:
- Always select the flue diameter according to the insert’s technical specifications.
- For most SAVEN steel fireplace inserts, the recommended diameter is 180 or 200 mm, depending on the model.
- Avoid long horizontal segments — they reduce draft.
- Use certified modular flue systems made of stainless steel or ceramic.
Ready-made modular systems and their components are gathered in the chimneys section.
What types of SAVEN steel inserts are there?
Mistakes with area, grilles and the flue often start even earlier — when a buyer does not know what types of inserts exist at all and simply takes the first model available. In the SAVEN catalogue, steel inserts are divided into four lines, and each solves its own task.
- Straight inserts — the classic solution with front glass. Suitable when the fireplace stands against a wall and the fire is viewed from one side.
- Corner inserts — with glass on two sides. Convenient when the fireplace is placed in a corner or on the boundary between a living room and a dining area, so the fire is visible from both zones at once.
- SAVEN Energy Up — inserts with a guillotine door — the door lifts upwards instead of opening sideways. This saves space in front of the fireplace and gives the effect of an open fire when the glass is raised. The line includes 12 models.
- SAVEN Balance — a separate series of four models; the dimensions and technical parameters of each are listed on the product page.
If the fireplace surround has already been built and an old open hearth needs replacing, the insert does not have to be chosen "for a surround" — for such cases there are fireplace cassettes that fit into the existing surround. And when building a surround is not planned at all, ready-made steel fireplace stoves are the alternative.
Output, efficiency and the recommended flue diameter differ from model to model — they are listed in the product specifications. It is these figures, and not average "market" values, that you should rely on when calculating output and selecting a flue.
How to avoid mistakes and make the right choice
To make your fireplace a reliable source of warmth, it’s important to choose a quality fireplace insert, calculate its heat output properly, ensure proper ventilation, and install a professional flue system.
Avoid common mistakes:
- Failing to consider the heating area.
- Neglecting ventilation grilles.
- Cutting costs on a proper chimney system.
How do you avoid choosing the wrong insert?
Here is a short summary of everything above in a single table — so that before buying you can go through it as a checklist.
| Mistake | Consequence | The right way |
|---|---|---|
| Output chosen "by eye", without calculating the area | The room overheats or, on the contrary, never warms up; the insert constantly runs at its limit and wears out faster | Start from the benchmark of 1 kW per 10 m² and adjust for insulation, the number of windows and ceiling height; check the result against the specifications of the specific model |
| Ventilation grilles too small, wrongly placed or missing altogether | Heat stays inside the surround, the cladding overheats, and the real output of the fireplace drops | Supply grilles at the bottom, extract grilles at the top; the open area matched to the output of the insert; heat-resistant material |
| Flue diameter chosen "at your own discretion" | Weak draught, smoke in the room, condensation and soot, risk of carbon monoxide poisoning | Diameter strictly according to the model data sheet (for most SAVEN inserts — 180 or 200 mm), a minimum of horizontal runs, a certified modular system |
| Insert type chosen without considering the room layout | The fireplace does not fit the interior: the fire is seen at an awkward angle, there is nowhere to open the door, and there is not enough space in front of the insert | Straight — against a wall, corner — in a corner or between zones, Energy Up with a guillotine door — when space in front of the fireplace is tight; for an existing surround — a fireplace cassette |
By choosing SAVEN steel fireplace inserts, you get:
- High efficiency — the exact figure depends on the model and is listed in the product specifications.
- Durable steel construction 3–5 mm thick.
- A wide range of models for any need — straight, corner, Energy Up with a guillotine door, and Balance.
- Compatibility with modern ventilation and smoke removal systems.
- A 5-year warranty on the insert plus an additional 2 years on the fireclay lining.
Don’t risk your home’s warmth and safety — choose your fireplace wisely. Contact SAVEN specialists or official partners to receive expert advice and find the ideal fireplace insert for your home. For prices of specific models, please check with a manager or a representative in your region.