Indispensable in every construction site
- portable warm air heaters

Portable warm air heaters are a sure way to quickly heat various locations and rooms. When other solutions fail or the conditions don’t allow for such solutions, these devices will surely deliver. They can be used both indoors and in open spaces.

Small, easy to use, quick to start and, above all, portable - it makes them appealing to professionals in construction, agriculture and industry, as well as do-it-yourself repairmen. Regardless of the situation and the conditions, however extreme they may be, some type of blow heater can be used. There are a lot of models to choose from, as there are electric, fuel oil, diesel and LPG devices available. This gives you the freedom to choose the one that suits your needs and conditions.

Portable air heaters can be divided into those meant to work at huge structures, at construction sites and road repairs, parking lots, etc., as well as for finishing works in houses, apartments or public facilities. The fact that they can be started in no time and are virtually always ready for action is a huge advantage. They also eliminate the need to install other types of costly heating.

Warm air heaters

Oil-fired heaters

Diesel or fuel-oil-fired blow heaters are some of the most popular devices used at construction sites to dry buildings, heat up closed spaces or even defrost machines in the winter. Their resistance to cold, high durability and efficiency make them a perfect choice for the construction industry, amongst others.

Oil-fired heaters can be direct or indirect. While the list of applications may be long, the latter perform very well in closed spaces, where people are working and ventilation is poor. Owing to its heat exchanger, the heater produces 100% clean air, while effective circulation ensures even heating. The ability to connect flexible distribution pipes is another advantage. The device can then be installed outdoors, and the heated air is brought indoors through heat-resistant tubes. These types of heaters are often used to heat work tents used for road repairs, piping repairs, etc.

Warm air heaters

On the other hand, direct heaters perform well in construction sites, e.g. to speed up the concrete drying process. One should remember, however, that they don’t have heat exchangers, so they can only be used in well-ventilated rooms or in the open.

Most heaters can be fitted with indoor thermostats in order to make them more efficient. They are also equipped with wheels and a comfortable handle to facilitate their transport and moving. They also have high air flow to allow for quick and efficient heating of any structure or workplace. The smallest direct heaters have a flow of 280 m3/h or more, while the most high-performance indirect models can reach 12 500 m3/h. Fuel consumption is relatively low - e.g. approx. 3.7 kg/h for a 44 kW Master B 150 heater. These parameters may of course vary depending on the manufacturer and construction.

LPG gas heaters

Gas-fired heaters are also often used in construction. They are used when steam is needed, e.g. to harden lime plaster, apart from hot air. It should, however be stressed, that they can only be used when appropriate ventilation is provided and when people do not work in the rooms being heated. These types of devices perform well in smaller structures and they are relatively inexpensive to use. They are portable, which means they are easy to transport and use. Other improvements can also be used, such as models with electronic starters that can be fitted with indoor thermostats. A gas tank connection set will effectively eliminate the need to replace empty tanks.

Warm air heaters

Electric heaters

Electric heaters can be used as a continuous source of heat used equally often in renovation works. They are great for smaller, temporarily heated rooms or to heat them in case of smaller finishing works. They are especially recommended for painters, plasterers and tilers, as they can be used easily and quickly. Several models with different parameters are available, which makes it easy to choose the right model.

One of their advantages is their silent, exhaust- and odour-free operation. There is also a model allowing for connecting a flexible tube to distribute hot air, which differentiates it strongly from other electric heaters. Some people may be bothered by the high operational costs of this type of devices, but their 100% efficiency and hassle-free installation may serve to alleviate these drawbacks.

Choosing the right power

Before deciding on the right heater, the minimal required power has to be determined. The volume of the room to be heated (V) has to be considered, as well as the required temperature increase (ΔT) and the thermal insulation coefficient, which depends on the type of construction and insulation (K). The heating power is calculated using the following formula:

V x ΔT x K = kcal/h

After the required heating power is determined, the heater can be chosen according to its intended use, type of fuel, efficiency, price or other factors. However, you should always remember to ventilate the room well when using blow heaters.

Heating power unit conversion

1 kW = 860 kcal/h
1 kcal/h = 3,97 Btu/h
1 kW = 3412 Btu/h
1 Btu/h = 0,252 kcal/h

See also

Warm air heaters - direct oil space heaters
Warm air heaters - indirect oil space heaters
Warm air heaters - infrared oil / kerosene heaters
Warm air heaters - gas heaters
Warm air heaters - electric fan
Warm air heaters - infrared electric heaters