The award winning internal Grant Vecta, is a revolutionary white cased condensing wood pellet boiler. Developed as a direct replacement for a floor standing fossil fuelled boiler, it makes biomass heating a viable alternative for most off-gas homes.

Vecta condensing internal wood pellet boiler range

Developed as a direct replacement for a floor standing fossil fuelled boiler, it makes biomass heating a viable alternative for most off-gas homes.

Its whisper quiet operation and sleek casing makes the Vecta ideal for installation within a kitchen or utility environment, and its patented condensing technology guarantees the highest efficiency possible.


  • Modulating output of 4-16kW
  • Designed and manufactured by Grant
  • Award winning condensing heat exchanger
  • Weather compensation
  • Automatic pellet feed and ignition
  • Lambda Sensor
  • Self-cleaning system for heat exchangers and burner brazier
  • Automatic wash system for condensing unit
  • Simple to install and maintain
  • Intelligent electronic monitoring
  • Whisper quiet operation
  • Top fill 60kg integrated hopper
  • Overall winner of SEAI Product of the Show 2015
  • Nett efficiency of 90.6% (reduced load) up to 94.8% (full load)

Weather compensation
The appliance can cleverly monitor the outside temperature and adjust the system water temperature to match a heat output closer to the needs of the home, thereby using less fuel and making the whole heating system more efficient. In fact, the system will adapt before it even feels too cold or too hot.

Filling the Vecta’s hopper
With a 60kg top fill integral pellet hopper the Vecta is designed to be bag filled.  Having no separate hopper means that the boiler is not only compact but far more versatile when it comes to siting. Alternatively, there is also the option of utilising a bulk store and vacuum system which will automatically fill the integral hopper for convenience.

Internal Side Pellet Store

The Vecta Internal is also available with an optional bolt on store (as shown in the righthand photo) which can increase the combined pellet storage capacity. This white cased side store (Part Code: WVP4/16STORE) has a capacity of 140kg and fits to the right hand side of the boiler only.

The store’s hinged lid with gas struts allows for top fill. Coming complete with a feed auger and cable, the combined pellet storage capacity of the side store alongside the boiler becomes 200kg.




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Biomass Boiler Case Studies

Living with a Grant Vecta biomass boiler

Grant UK visited Mike and Sarah Hodgson who recently had a Vecta wood pellet boiler installed at their property, to discuss why they chose this renewable technology and to uncover a homeowner’s perspective of living with biomass. At the beginning of 2017, Mike and Sarah Hodgson had an internal VectaRead More

Colchester United has gone to the green side with a 72kW Spira

The Florence Park training ground of Colchester United Football Club is now being kept warm by a Grant Spira biomass boiler. The heating system at the premises was previously fuelled by LPG so, since the installation of the 72kW Spira, the club is now benefitting from cheaper fuel costs andRead More

Clean and Efficient – Spira gets the thumbs up in Hampshire

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Grant biomass boilers earning their keep for homeowners

Grant UK often receives positive feedback from installers on the financial benefits their customers are seeing after having a Grant condensing biomass boiler installed in their property, especially those receiving the Government’s Renewable Heat Initiative (RHI). The Non-Domestic and Domestic RHI financially support businesses, the public sector, and homeowners withRead More

Spira biomass boiler takes residence at Steadings Park in Suffolk

Steadings Park, a campsite and caravan touring park in Suffolk, recently installed a Grant Spira biomass boiler as an environmentally friendly, cost efficient solution to heating their newly built state of the art shower block. Located near a nature reserve in the beautiful back-drop of the Suffolk countryside, Steadings Park’sRead More

Grant biomass boilers are keeping installers busy

The social media feeds of Dryad Energy Ltd have been filled with red recently – red Grant Spira biomass (wood pellet) boilers! Dryad Energy has been incredibly busy installing Spira boilers in domestic properties throughout the South with photos from these installs occupying their newsfeeds. We have been speaking toRead More

It is easy being green with a Grant biomass boiler

We revisit a factory in West Yorkshire which upgraded its existing heating system with a Grant biomass boiler just over two years ago. Installed under the non-domestic Renewable Heat Incentive (RHI), the Spira is not only keeping the factory warm but also significantly reducing the premises’ fuel costs and generatingRead More

Property developer chooses Grant Biomass for new build

With any new build, how to heat it efficiently and effectively are a designer’s high priority and this was no more evident than on a fantastic new residence in Grimsby. A large PV array was installed in the garden to provide sufficient power to the property and also take advantageRead More

Dual fuel is twice as good

A large residence in Norfolk converts from a standard oil fired system to a renewable biomass boiler and condensing oil boiler combination, reaping the benefits of both high product efficiency and low running costs. This beautiful 19th century, six bedroomed residence on the Norfolk Broads has undergone a complete heatingRead More

East Green Energy lead the way with Grant Spira

Renewable energy specialists East Green Energy are leading the way by installing an award wining Grant Spira Wood Pellet Boiler in their showroom at the Company’s Suffolk headquarters. Believed to be the only showroom in East Anglia with a fully working Wood Pellet Boiler, it is certainly generating a greatRead More

Grant Spira biomass boiler cuts fuel bills

A homeowner in Norfolk has noticed an immediate drop in fuel costs following the installation of a 26kW Grant Spira Wood Pellet Boiler by MCS Approved Green Home Energy Solutions. The Spira Wood Pellet biomass Boiler, which replaces an eighteen year old oil fired boiler, will provide heating and hotRead More

Installer promotes advantages of renewable heating

Long established plumbing and heating installers, Great Yarmouth Heating Company Ltd, is promoting the benefits of energy saving, by kitting out their premises with an array of Grant MCS approved renewable technologies. Based on Gapton Hall Industrial Estate, GYH was founded in 1971 and has installed, serviced, and maintained GrantRead More