A refrigerator is a preservation appliance that keeps food chilled between 0 and 8 °C —and below zero in its freezer—; it is classified by format (single door, combi, American or side-by-side) and by its cooling system, with No Frost being the one that prevents frost and distributes air evenly.
Choosing a refrigerator seems simple until you stand in front of the catalog and acronyms appear: combi, SBS, No Frost, inverter, class D or E, 242 or 592 liters. This guide organizes all of that on a single page so that you know which format fits your kitchen, how many liters you really need, and what is hidden behind each technology. All examples and technical data are taken from real product sheets in the Merkimarket refrigerator catalog.
Key refrigerator data
- Function: to preserve food by cold, with a cooling zone (0–8 °C) and a freezer (usually below -18 °C).
- Main formats: single door, combi (refrigerator on top, freezer on the bottom), American or side-by-side (SBS) with two vertical doors.
- Cooling systems: static, cyclic, and No Frost (ventilated, with no frost formation).
- Typical capacities: from about 240 liters in single-door models to almost 600 liters in the largest American ones.
- Efficiency: energy rating from the European label; classes D and E predominate in the catalog.
- Compressor technology: models with an inverter motor, which adjusts power and reduces noise and consumption.
- Warranty: legal minimum of three years for consumers in Spain, plus the seller's commercial warranty.
With this, you have the map. Now let's develop each decision so you can buy without regrets.
What refrigerator formats exist
The first filter, and the one that most determines the price and the space you need, is the format. These are the three main types you will find:
Single door. The classic refrigerator with a single cooling compartment and, at most, a small interior freezer. It is the most compact and economical option, ideal for small kitchens, second homes, or as a secondary unit. In the catalog, this is represented, for example, by the Bolero CoolMarket 1D 242, with 242 liters.
Combi (combination). It is currently the best-selling format: refrigerator at the top and freezer in the lower drawers. It offers high freezing capacity without taking up more width than a standard fridge (about 55–60 cm). Within the catalog, there are combis from 250 to almost 500 liters, with finishes in stainless steel, white, black, and glass.
American or side-by-side (SBS). Two vertical doors, refrigerator on one side and freezer on the other. It is the format with the greatest capacity and presence, designed for large families and spacious kitchens. It needs more width (around 80–90 cm) but provides extra liters: the Bolero CoolMarket SBS 592 reaches 592 liters.
No Frost, static or cyclic: the cooling system that makes the difference
Beyond the format, what determines your daily convenience is how the appliance cools. There are three systems:
Static cooling. The most basic. Cold is distributed by natural convection, more cold accumulates in the upper part, and frost tends to form in the freezer, which must be defrosted manually. It is economical and quiet, but requires maintenance.
Cyclic (or dynamic) cooling. Incorporates a fan that distributes the air and homogenizes the temperature in the refrigerator, although the freezer may still generate some ice.
No Frost. This is the ventilated system that prevents the formation of frost: air circulates by force and humidity is extracted and evacuated, so you never have to defrost the freezer. It also distributes the temperature uniformly, which helps preserve food better. In return, it can slightly dry out unwrapped products and is usually somewhat more expensive. If you loathe the task of defrosting, this is the option to look for; always check the product sheet to see if the specific model incorporates total No Frost or only in the freezer.
Combi vs. American: comparison table
If you are hesitating between the two most popular formats, this comparison summarizes where each one wins:
| Format | Typical capacity | Approx. width | Ideal for | Example from the catalog |
|---|---|---|---|---|
| Single door | 240–250 l | ~55 cm | Small kitchens, secondary unit or second home | Bolero CoolMarket 1D 242 |
| Combi | 250–495 l | 55–60 cm | Most households; good balance of liters/space | Bolero CoolMarket Combi 322 Inox |
| American (SBS) | 430–592 l | 80–90 cm | Large families and spacious kitchens | Bolero CoolMarket SBS 430 / 592 |
In short: the combi is the safe bet for most Spanish kitchens, while the American model pays off when you have plenty of room and a large family that fills the fridge every week.
Capacity: how many liters you need according to your home
The million-dollar question. Don't fall short, and don't pay for liters you won't use. A practical and widely accepted rule is to reserve about 100 liters for the first occupant and add about 50 liters for each additional person, adjusting upward if you cook a lot, do large grocery shops, or freeze frequently. Translated into formats:
- 1–2 people: 240 to 300 liters. A single door or a compact 250-liter combi are more than enough.
- 3–4 people: 320 to 400 liters. The natural territory of 322 to 356-liter combis.
- 5 or more: from 450 liters upwards. This is where large combis (495 l) and American models from 430 to 592 l come in.
Remember that the total figure is usually divided between the refrigerator and freezer; if you freeze a lot, look specifically at the liters of the freezer zone on the product sheet.
Consumption and energy label: how much it really spends
The refrigerator is one of the few appliances that is plugged in 24 hours a day, so its efficiency is reflected in your annual electricity bill. The European energy label (with the A to G scale effective since 2021) shows you the class and the estimated annual consumption in kWh. Models in class D and E predominate in the catalog, a reasonable range in terms of value for money; the closer you get to A, the less you will spend, although the appliance usually costs more initially.
Two factors help lower real consumption: the inverter technology of the compressor, which modulates power instead of starting and stopping abruptly (less noise and less waste), present for example in the Combi 250 Inox D; and correct placement, far from heat sources and with space to ventilate. If you want to learn how to interpret the label thoroughly, we explain it in our guide on the energy label and how much you really save.
How to choose your refrigerator in 5 steps
- Measure the space. Width, depth, and height, leaving a few centimeters of clearance for ventilation and for opening the doors. This is the step that avoids the most returns.
- Choose the format. Combi for most, single door if space is tight, American if you have the space and a large family.
- Calculate the liters. Apply the rule of ~100 l for the first person and +50 l per additional person, and adjust according to your shopping and freezing habits.
- Prioritize No Frost and inverter. They save you manual defrosting and lower consumption and noise. Confirm both data points on the product sheet.
- Look at the energy class and the finish. Balance purchase price and annual expenditure, and choose color (stainless steel, white, black, or glass) to match your kitchen.
Installation and basic maintenance
A well-placed refrigerator lasts longer and spends less. Let it rest upright for a few hours before plugging it in if it has traveled lying down, separate it a few centimeters from the wall so it dissipates heat, and avoid placing it next to the oven or in direct sunlight. In daily use, clean the door seals so they close hermetically, do not put in hot food, and maintain a reference temperature of about 4–5 °C in the refrigerator and -18 °C in the freezer. If your model is not No Frost, defrost the freezer when the ice layer exceeds half a centimeter.
Ready to choose? Explore the full catalog of refrigerators and fridges, compare a best-seller like the 322-liter stainless steel combi and, if you are renovating your entire kitchen, check out our guide on how to choose a washing machine according to capacity and consumption.
Frequently asked questions about refrigerators
Which is better, a combi refrigerator or an American one?
It depends on the space and the size of the household. The combi offers the best ratio between liters and space for most kitchens (55–60 cm wide), while the American or side-by-side style provides more capacity and presence, but needs 80–90 cm of width and is mainly worthwhile for large families.
What does it mean for a refrigerator to be No Frost?
That it uses a ventilated cooling system that prevents the formation of frost and ice, so there is no need to defrost the freezer manually. It also distributes the temperature uniformly, which improves food preservation.
How many liters of refrigerator do I need?
A practical rule is to count about 100 liters for the first person and add about 50 liters for each additional member of the household. Thus, a couple gets by with 240–300 liters and a family of four usually needs between 320 and 400 liters.
How much does a refrigerator consume?
It depends on its energy class, its capacity, and the compressor technology. The European energy label indicates the estimated annual consumption in kWh; models with an inverter compressor and correct placement (ventilated and away from heat) significantly reduce real expenditure.
Article written by the Merkimarket editorial team. Data on capacity, format, and finish taken from real product sheets in the Merkimarket refrigerator catalog. Energy classes, price ranges, and availability may vary; check each product sheet for current information in Spain.
