Central External Log Boiler


This property had access to woodland and logs, which meant a log boiler was the obvious choice, due to minimal fuel costs and sustainable carbon neutral credentials. However the property had no usable internal space for an internal log boiler and thermal store. So we decided to overcome the issue by utilising the outside space and installing an external log boiler. The perfect solution was to use a 45kW Central E-Classic outdoor log boiler, due to its weather proofing and stand –alone design providing a flexible location for the installation.

The advantage to using this type of boiler, is essentially all components are housed within the boiler as pictured, which offers a compact solution to log burning. The Central E-Classic has an integrated thermal jacket, which means there is no need for a thermal store. The boiler is connected to the internal heating connection via an insulated pipe running over ground, however in many installations we run insulated underground piping.

The E-Classic requires a manual load and can take logs of up to of 750mm in length. A full load will typically produce enough heat and hot water demands for 4-5 days in the summer and 2-3 days in the winter. The Central requires cleaning once every 6-7 weeks.

The end result of the installation provides a fuss free biomass option, which has no impact on the internal spacing with a home. The boiler can be located anywhere outdoors so provides a flexible solution to log burning for hot water and heating.

RHI Payment over 7 years: £42,067

Fuel Saving over 7 years: £22,633

Kingscote Vineyard


Fuel Saving over 20 years: £238,677

RHI Payment over 20 years: £264,101

Set in a rural location, the Kingscote Vineyard required a heat source which would provide constant heat to a period barn, which has a large heat load. Under floor heating was chosen for this beautiful 17th century barn, as it solved all aesthetic issues and provided a constant heat source even when the barn doors are open. Due to the large heat load a pellet boiler was chosen due to its high calorific heat source.

This project required A Greener Alternative to install a Froling 85kW pellet boiler into a small barn which would act as an energy centre and pellet store. The boiler would feed underfloor heating to the magnificent 17th century barn which had been relocated piece by piece to form the centre point for the vineyard.

National Trust


Fuel Saving over 7 years: £14,083

RHI Payment over 7 years: £26,175

This national trust property wanted to make use of various forms of sustainable energy. The Property had a south facing pitched roof and was set in densely populated woodland. Therefore it was decided that a combination of thermal solar, log boiler and log stove would be used to harness the carbon neutral assets surrounding the home and produce the heating and hot water for this unique ecological home.

A Greener Alternative worked with the national trust to create a bespoke system which would be perfectly balanced for the needs of this unique building. The use of multiple ecological technologies demonstrates the skills required to create a fully sustainable and efficient system.

The boiler is a 28kW froling log boiler and was housed in the utility section of the house with buffer tank. The solar thermal are a combination of flat plates and tubes. The log burning stove is not connected to the hot water system and provides room heat only.

Colchester Zoo


Fuel Saving over 20 years: £195,593

RHI Payment over 20 years: £621,415

Colchester zoo has a dedication to the environment and conservation, so it was an obvious choice to convert to using biomass, as it would solve both high fuel bills and create a carbon neutral heat solution. The premises is a large Victorian period building and required a significant heat load with an efficient calorific fuel source, therefore a pellet boiler was chosen for the project.

A Greener Alternative fitted a 200kW wood pellet boiler to provide hot water and heating to the main building. As you can see from the photo’s access was difficult, but not an impossible task with the use of a crane.

The boiler, hopper and buffer tanks are situated in a container unit turned energy centre. The installation also has a steel framed external 7 ton pellet store. The system is fully automated and pellets are blown delivered.