Frequently Asked Questions

Frequently asked questions (FAQs) associated with the rental of mobile energy units

Mobile energy units were originally conceived as an emergency measure in case of failed systems. Meanwhile their routine use is in demand, especially in cases of extensive refurbishing of heating, cooling or steam systems. HOTMOBIL provides a modern rental fleet covering all output ranges for this purpose. This allows extensive temporary measures to be carried out without detriment to the energy supply.

When retrofitting an entire energy generation system, can mobile energy units be used to maintain an uninterrupted energy supply without having to perform any modifications or temporary measures?

Hotmobil: Apart from ensuring that the entry points for the media supply in the building’s ducting have been suitably prepared, no modifications have to be made to the building’s systems. A mobile energy unit is delivered on-site on the agreed date, connected via flexible and pressure-resistance hoses to the building’s systems and then put into operation. In this way, heating, cooling or steam units and their distribution systems can be dismantled and reinstalled without having to interrupt the energy supply.

Energy supply systems can develop different faults. What are HOTMOBIL Mobile Energy Units used for and when can they provide a solution? And when is it actually worth using a mobile energy unit?

Hotmobil: HOTMOBIL specialises in supplying mobile energy to buildings’ technical systems. In particular, we offer mobile solutions for supplying heating and cooling energy, hot water and steam. We offer Mobile Heating Units, Mobile Cooling Units, Mobile Hot Water Units and Mobile Steam Units. We also offer small Mobile Electric Heaters with an output of up to 40 kW. In addition, we have a large range of auxiliary equipment including Mobile Air Heaters, Mobile Tank Units, Mobile Pumps, Mobile Heat Exchangers, Mobile Storage Units, Mobile Expansion Tanks, etc. Our products provide ideal temporary solutions when energy systems fail. They can be used in a variety of different situations, for example, when carrying out renovation work, after natural disasters, during construction delays or when building work has been completed more quickly than expected, for special and process applications, if there are delivery problems, for peak load coverage, etc. When used for longer periods of time, it may make economic sense to actually purchase a mobile energy unit. To this end, we have our own planning department and state-of-the-art manufacturing areas.

What are the costs of using Mobile Energy Units?

Hotmobil: The hire charges for the energy units used are calculated on the basis of the number of days of use and the output of the unit. Additional flat rates are charged for transport and commissioning. If the duration of use is known from the outset, the costs can be determined from the beginning./p>

What do the delivery and operation of a Mobile Energy Unit require at the installation site?

Hotmobil: The selection of a suitable Mobile Energy Unit starts as early as the planning stage. At the installation site, the units can be installed next to the building to ensure the shortest possible connection route to the object, for example, near a cellar window or basement opening. If direct access to the installation site is restricted or not possible, various models can be lowered into position by crane. With larger projects, a HOTMOBIL project consultant provides customer support and, before order placement, checks the local conditions and routes for connecting the unit.

How is the unit connected to the buildings system?

Hotmobil: The hire units are fitted with hose couplings for connecting to the building’s ducting. HOTMOBIL’s service engineers connect these via pressure and temperature-resistant hoses to the entry points of the building’s ducting.

How are Mobile Energy Units described in the specifications? What are the billing units? What does the building owner have to provide and tender separately?

Hotmobil: For inclusion in the specifications, tender texts for all energy units and other products are available to download from The billing unit is the rental period in days. Delivery, connecting the energy units, commissioning and instruction are included as separate items in the bill. The customer commissions a specialist to install the necessary entry points to connect the hoses. The customer is responsible for providing the power supply and, if necessary, for sourcing the fuel (heating oil or gas) for the Mobile Energy Unit. For the latter, we also offer a so-called fuel management service.

Are the Mobile Energy Units just available in certain regions?

Hotmobil: Hotmobil Deutschland GmbH has more than 1.600 units for hire at a total of nine locations, namely at its headquarters in Gottmadingen in South Germany and at its branches throughout Germany. All enquiries regarding mobile energy units are initially taken by the Service Hotline at the company headquarters in Gottmadingen, South Germany. They are then processed and coordinated to ensure that the customer has a single contact person and that the whole process runs as smoothly as possible. HOTMOBIL customers can sign an energy guarantee with the company. This ensures a guaranteed delivery within six hours.

Who is responsible for ensuring the reliable operation of the units? What service does HOTMOBIL offer?

Hotmobil: HOTMOBIL has its own employees for installation and commissioning. This also includes assembly, delivery and removal. After commissioning, HOTMOBIL officially hands over the Mobile Energy Unit to the relevant company and instructs employees on how to work with it. From this time onwards, while the trade business is responsible for operating the energy unit, in the event of any malfunction, the HOTMOBIL troubleshooting service in on hand 'round the clock' to provide support.

How reliable are mobile energy units? Which technological standards do they comply with? In order to achieve low fuel or electricity costs, are the units energy-efficient?

Hotmobil: The technology featured in the Mobile Energy Units consists of the very latest plant components currently available on the market. HOTMOBIL also attaches great importance to servicing the units after each use and testing their energy consumption. Furthermore, we practice a certified quality management system as per DIN ISO 9001.