Modular hybrid heating
Modular hybrid heating with Aurora Block gives construction sites, properties and industry heating, cooling and drying from the same modules. Start with one module and add capacity as the need grows. Spine runs the whole system automatically and can be operated remotely.
Go straight to the product details →Heating is sized once — and paid for all winter
Temporary heating is often handled with a single large unit that has to fit on the plot and that runs at the same output whatever the conditions. Modular hybrid heating starts from the other end: capacity is added as the need grows.
The heating container does not fit on the plot
A tight city-centre site has neither room for a large container nor a route to move it. Stackable modules fit into narrow installation corridors and can be lifted onto an intermediate floor or a roof.
Capacity is oversized just in case
When output cannot be added later, it is bought up front for the coldest spell. For most of the winter the equipment then runs at part load.
Oil is burned even when it is not needed
In a single-source system the fuel is consumed the same way at zero degrees as in hard frost. A heat pump would produce the same heat at a fraction of the cost.
An interruption stops the drying
A power cut or a fault stops the heating, and the structures stop drying. The schedule slips even if the fault itself is fixed quickly.
How modular hybrid heating works — one water circuit, three heat sources
The modules are connected in series in the same water circuit. Water returning from the site runs through the chain, every module in operation adds heat, and the last one feeds the building.
- Heating network
- WH water circuit heaters
- Floor heating and drying
1.Water runs through the modules. Return water from the site is led into the Aurora chain. The modules are connected in series in the same water circuit.
2.Spine uses only the capacity needed. The heat pumps run first, the electric element as backup and oil heating last.
3.Heat is transferred to the site. Aurora can be connected straight to the heating network or to water circuit heaters.
4.Capacity can be added. As the demand grows, more modules are connected to the same circuit with no upper limit.
Arctic Warm’s free calculator gives you the output demand and a suitable module combination before you request a quote.
Spine runs the whole system
Spine remote control is included with every module as standard, together with a five-year licence. The same platform also monitors site electricity and conditions.
Automatic cascade control
Spine starts only as many modules as the demand requires. The heat pumps act as the primary heat source, the electric element as backup and oil last.
Remote control and alarms
You see temperatures, energy consumption and equipment status remotely. Settings can be changed without a site visit, and deviations raise automatic alarms.
The same system for heat and power
Spine can also monitor site power distribution. Spine Valve lets you control heating floor by floor or zone by zone on the same platform.
Where modular hybrid heating fits
Temporary heating
Replaces heat production while a boiler, a district heating substation or another system is out of service.
Site heating and drying
Produce the heat for water circuit heaters and adjust the conditions to the work stage.
Long-running sites
Aurora 50 uses ground-source energy and suits installations that last for months or years.
Backup output
Aurora 64 adds output to the system and keeps the heating running through a power cut.
Sizing modular hybrid heating: example configurations
Modular hybrid heating is sized in modules: build the capacity you need one module at a time. Air-to-water heat pumps, ground-source heat pumps and the oil backup can be combined in the same set-up.
| Configuration | Output | Output at −15 °C | Typical site |
|---|---|---|---|
| 1 × Aurora 28 | 28 kW | 23 kW | Site huts, small buildings, drying |
| 2 × Aurora 28 | 56 kW | 46 kW | Temporary heating for an apartment building |
| 4 × Aurora 28 + Aurora 64 | 176 kW | 156 kW · 80 kW of cooling | Heat pumps for the base load, oil for peak and backup |
| 2 × Aurora 50 + Aurora 64 | 167 kW | 144 kW from the ground-source modules + 64 kW oil backup | Long-running temporary installations |
| 8 × Aurora 28 + 3 × Aurora 64 | 416 kW | 375 kW · 160 kW of cooling | Campuses, industrial halls, large properties |
Peak outputs: Aurora 28 A7/W35, Aurora 50 B10/W35, Aurora 64 nominal. Outputs at −15 °C: Aurora 28 A−15/W35, Aurora 50 B0/W35. The 9 kW electric element in Aurora 28 is not included in the figures above.
The same modular hybrid heating equipment also cools
Modular hybrid heating is not only about heat. Aurora 28 heats in winter and cools in summer: the modules are connected in series in exactly the same way, and Spine adjusts the cooling output to demand. Only the modules that are needed run — the rest stay on standby. One set of equipment, used all year.
Cooling where it is needed
Temporary cooling
Replaces a building’s own cooling during a fault, a service break or a renovation.
Server and electrical rooms
Temporary or seasonal cooling for IT and electrical spaces that cannot be allowed to overheat.
Events, halls and tents
Add or remove capacity according to the space and the situation, from a single module upwards.
Drying and humidity control
Combining cooling and heating removes moisture from the air and keeps site conditions under control.
Care and residential spaces
Temporary cooling during heatwaves for buildings with no adequate fixed cooling.
Process cooling
Temporary cooling capacity for industry without a permanent investment.
| Configuration | Cooling output | Typical site |
|---|---|---|
| 1 × Aurora 28 | 20 kW | Server room, small office, meeting room |
| 2 × Aurora 28 | 40 kW | Event tent, retail space, care home ward |
| 4 × Aurora 28 | 80 kW | Temporary cooling for an office building during a fault or a renovation |
| 8 × Aurora 28 | 160 kW | Halls, campuses, process cooling |
Nominal cooling output 20 kW (A35). EER 3.55 at a flow temperature of +18 °C and 2.22 at +7 °C. The circulating fluid can be water, glycol or ethanol. Cooling is delivered by Aurora 28; Aurora 50 also cools, while Aurora 64 is a heat-only unit.
Modular hybrid heating — system basics
Comparing the modules
Three modules in the same water circuit. Each of them also works on its own.
| Property | Aurora 28 | Aurora 50 | Aurora 64 |
|---|---|---|---|
| Unit type | Air-to-water heat pump | Ground-source heat pump | Condensing oil boiler (diesel/HVO) |
| SKU | 1050601001 | 1050601004 | 1050601002 |
| Output | 11.4–28 kW | 20–51 kW | 64 kW |
| COP / efficiency | up to 4.1 | 4.5 (B0/W35) | 90–98 % |
| Fluid temperature range | −10…+60 °C | −12…+60 °C | up to +90 °C |
| Main functions | Heating, cooling, drying | Heating, cooling | Backup and peak heat |
| Role in the hybrid | Base load | Base load on ground-source sites | Peak output, backup and power cuts |
| Cooling | Yes, 20 kW (A35) | Yes | No |
| Power supply | 32 A / 400 V | 3 × 32 A / 400 V | 230 V · 8 h battery |
| Fuel tank | – | – | approx. 500 L (also HVO) |
| Dimensions (W × D × H) | 1140 × 1440 × 1600 mm | ||
| Weight | 370 kg | 495 kg | 450 kg |
| Connection | 2″ flange · DN50 · PN16 | ||
| Spine remote control | Standard, five-year licence included | ||
| Placement | Stackable and liftable modules | ||
Aurora Frost — ground thawing as a unit of its own
Ground thawing is not part of the modular hybrid heating water circuit; it has its own mobile trailer. The heat comes from the same 64-kilowatt condensing oil boiler as in the Aurora 64 module.
0–400 m² thawing area
600 metres of thawing hose on motorised reels — one person can roll the hose out and reel it back in.
A standalone unit
Mobile trailer, 230 V supply, 700 kg with an empty tank. No other Aurora equipment is needed on site.
Frequently asked questions about modular hybrid heating
What does modular hybrid heating mean?
The system is built from separate modules that are joined into the same water circuit to form one whole. It uses several heat sources – air, ground and fuel – and Spine switches between them automatically according to the conditions.
Where are the modules connected on site?
Aurora can be connected straight to the building’s heating network, to a separate circuit or to water circuit heaters. The connection is a 2-inch flange (DN50, PN16) and the recommended main line is 50 mm.
When does the backup heat start?
Automatically, when the heat pumps cannot cover the demand or the power fails. The Aurora 64 oil boiler has an eight-hour battery backup and produces water at up to +90 °C.
Can a single module be removed for service mid-season?
Yes. Every module has shut-off valves at both ends, so one module can be isolated, serviced or swapped mid-chain while the rest of the system keeps running.
How much cooling can the system deliver?
Aurora 28 provides a nominal 20 kW of cooling (A35), so four modules give 80 kW and eight give 160 kW. The EER is 3.55 at a +18 °C flow temperature and 2.22 at +7 °C.
Can the same modules heat and cool in the same season?
Yes. The equipment is switched between heating and cooling as the need changes, which makes it practical for sites that are dried in spring and cooled in summer.
How far does the system scale?
From one module upwards with no fixed ceiling. The example configurations reach 416 kilowatts, and capacity is added in stages as the build progresses.
Which circulating fluid does the system use?
Water, glycol or ethanol in a closed circuit at a maximum of 3 bar. The pipework and frame are acid-proof and the circulation pump is self-venting.
Where can the modules be placed?
The modules are stackable and fit into narrow installation corridors. They can also be lifted onto a balcony, an intermediate floor or a roof.
Is the system suitable for ground thawing?
Ground thawing uses a separate Aurora Frost trailer with 600 metres of thawing hose and a thawing area of 0–400 m². It is not part of the water circuit chain.
Does the site need a separate network connection?
No. Spine remote control is built into the modules and works without a local network.
Aurora Block modules
Three modules in the same water circuit and a separate ground thawing trailer. Add the units you need to the quote cart.
TSR WH water circuit heaters
Modular hybrid heating produces the heat, and the water circuit heaters distribute it around the space. Pick the output to match the size of the site.
Aurora Block product sheets
Every unit has a one-page product sheet in PDF format. The sheet covers the key features, the Spine integration and the full technical table.
Two ways forward
Request a quote
Add the modules you want to the quote cart and send the request. We will size a suitable configuration for your site and confirm the delivery time.
Go to the modules →Calculate the heating energy demand
Arctic Warm’s free calculator gives you the site’s output demand and a suitable module combination. A ready sizing speeds up the quote.
Open the calculator →The rest of our site heating equipment is on the worksite heating page.