Jaspi Multi Energy boilers

Market leading true multi energy boilers. Powerful & reliable with complete choice of fuels now and in the future.
These multi energy boilers can powered by Oil, Gas, Logs, Briquettes, Pellets, Solar thermal, Mains electricity, Solar PV, Wind- and Hydro turbines.


Jaspi Duo 1 & 2, Triplex 1000, 2000 and 3000


Our range of multi energy boilers can run with up to six different forms of energy, simultaneously.

They offer the ultimate flexibility when choosing the heating system and even further, they can be changed to use a different form of fuel at any point in the future.

For the user, Jaspi multi energy offers the convenience of an automatic burner boiler, like an oil boiler  the economics of a traditional wood boiler and the energy saving of the renewables - all in one unit.

To further increase the choice of fuels, all our multi energy boilers have a built-in electric backup heater which can be used to boost the power output when the heat demand is high or as a sole source of heat when less heating power is needed. This electric element can also be powered by solar photovoltaic panels, water- or a wind turbine. In short, for example a Duo 2 boiler can use; Oil, Wood, Solar thermal, Solar photovoltaic, wind and mains electricity simultaneously.

With this kind of flexibility the boiler can run for example with solar and wind as main heat sources and the wood and oil are only for a back-up. We have customers who are running their boilers this way, effectively running their heating for free.


Our multi energy boilers can be divided into two groups;
- Twin furnace boilers with a traditional, cast iron wood furnace Duo 1 & 2
- Twin furnace boilers with high efficiency, ceramic gasifying wood furnace Triplex 1000 & 3000

Everyday Use

Jaspi multi energy boilers are extremely simple to use.
Most commonly they are used as a normal oil or gas fired boiler during the week and at the weekends the logs are burned to reduce the oil consumption or, if connected, to charge an external heat store.
The user does not need to do anything when changing from oil to wood, simply light up the logs and when the wood  is at the running temperature, the oil / gas burner automatically shuts down.
If the boiler is connected to the solar, wind or hydro power, these can have the priority and the oil and wood are only used as a back-up.


Jaspi multi energy boilers have two burning chambers side by side, one for solid fuel like logs, large briquettes, blazer logs or any other compressed fuel logs, for example peat.
The second burning chamber is for the burner. This burner can run on oil or biofuels, gas or LPG.
As standard our boilers are delivered with a Riello oil burner. This burner can be easily adjusted to match the property's heat demand between 19-35kW. The power adjustment table can be found here.
These boilers need only one flue which must be rated to class 1 for solid fuel. Balanced flues are not suitable as the wood burning needs a good draft to work.
Our multi energy boilers have a large internal water tank so they can be connected directly to the domestic hot water system and radiators / underfloor heating without a need for a hot water cylinder or a thermal storage tank.
If logs are used frequently, it is recommended that the boiler is connected to a thermal storage tank. This increases the capacity of the stored heat and the wood boiler's efficiency.
An external thermal store should also be used if the heating system is expanded to other heat sources like larger solar thermal systems and heat pumps.

Duo 2 and Triplex 3000 multi energy boilers can also be fitted with a separate solar coil which allows a direct connection to solar thermal panels (max. 4sqm). The solar heat is then transferred directly to heating and domestic hot water without a separate buffer tank. If the solar panel area is larger than 4sqm, we recommend that a thermal storage tank is added to the heating system.

Ready for Heating and Hot Water

All our multi energy boilers are fitted with a domestic hot water coil and a Termomix heating mixing valve.
The powerful domestic hot water coil will produce mains pressure hot water as and when it is needed.
Termomix heating mixing valve connects directly to the heating flow & return. This valve can be fitted with an automatic temperature controller, which can be a constant temperature controller for underfloor heating or a weather compensated controller for radiators. See a drawing here.

An additional heating mixing valve set can be added to all of our multi energy boilers. This allows the boiler to supply two separate temperature heating flows which is often used in houses with a mixture of radiators and underfloor heating or if a part of the property is used only occasionally or different times of the day.

Comparison Table

Product Power
Burner + Wood + Electricity
Ceramic, gasifying wood burning Weight
Water Capacity
Max Log length cm Recommended thermal store size, if fitted
Duo 1 22+20+6kw no 300 160 30 500-1500L
Duo 2 26+25+6kw no 365 235 50 500-2000L
Triplex 1000 25+25+6kw yes 335 235 30 500-2000L
Triplex 3000 35+25+6kw yes 380 235 30 700-3000L

Price list GBP
Jaspi Multi-Energy boilers

Boiler model Price GBP Info
Duo 1 £2,835.00 more
Duo 2 £2,950.00 more
Triplex 1000 £3,030.00 more
Triplex 3000 £3,475.00 more
Upgrade from oil
burner to Gas / LPG burner
Round Flue Adaptor £65.00
Above prices exclude UK VAT of 20%.


Download multi energy boiler brochure    

More information, manuals and drawings can be found from our downloads page.

Duo 1 & 2

Planning your installation

On our downloads page you can find standard installation drawings for our multi energy boilers. These drawings can be used to get quotations from the local installers or to design the complete heating system. There are several versions for different boiler models with or without a thermal store.

An example drawing of the Triplex boiler with a thermal store can be downloaded from here.




All of our large products like the thermal stores and boilers are delivered directly from the factory to the customers.
Most of them will also need a forklift or similar for unloading.
More information can be found from here:

How to purchase

All our standard products can be ordered through this website. Please find out how to order by following this link:


NORTHMAN JASPI UK  01392 247 343