CASE STUDY: The Toll House

The Toll House

Stove Shop has supplied and fitted a Palazetti Ecofire Insert Idro wood pellet burning stove to provide all the heating and domestic hot water for this project.

The stove is connected to a heat store cylinder similar to the one shown below. From this cylinder is drawn the hot water to circulate through four independently controlled under floor heating circuits and the upstairs radiator circuit.

The cylinder also supplies mains pressure hot water at a blended temperature adjustable between 45 and 60 degrees.

PROS:

-          Domestic and automatic

-          Programmebale

-          Pellets cheap; saves over 60% compared to burning fossil fuels

CONS:

-     Not a large hopper; needs filling once every 24 hours

GOOD FOR:

-          Listed buildings

-          Small dwellings

FoFor more information on this case study or others, please call us on 01579 345018 or email sales@stoveshop.co.uk 

CASE STUDY: Estate House Installation

Baxi Solo Innova 50 Installation

Neil Austen and Stuart Bennett went to Denmark and spent three days at the Baxi factory, receiving lectures and hands on training in firing and commissioning techniques. This led to their being accredited installers of Baxi’s wood burning and multi fuel boilers.

 

Back in Cornwall, we met the challenge of fitting the Solo Innova 50 into an existing boiler room. Two 800 litre cylinders connected in tandem accept the heating loads and still leave space for a walk way. A new 1500 x 450 foam insulated hot water cylinder (out of frame) cares for domestic hot water to four bathrooms. To accommodate the increased expansion of the system (calculated at 150 litres) a new 300 litre head tank was installed in the loft. 

The entire heating load of 75,000 btu and the whole domestic hot water requirement can be met using dry wood from the estate managed woodland in the 50kW Baxi Solo Innova burning once, or sometimes twice a day. 

The house has formerly heated by an inefficient and expensive to run oil boiler but now grows its own fuel.

PROS:

-          Whole boiler run on waste wood from estate

-          Linked together automatic oil fired boiler with a wood burning boiler (50kW)

-          Developed bespoke system to fit into the property

CONS:

-          Incredibly labour intensive

-          Vast storage required

-          Wood needs storing for two years before it can be used

GOOD FOR:

-          Estate homes and manor houses

FoFor more information on this case study or others, please call us on 01579 345018 or email sales@stoveshop.co.uk 

CASE STUDY: Welsh Farm Cottages

Neuadd Farm Cottages

A Baxi Solo Innova 50 wood boiler coupled with four solar manifolds with twenty two evacuated tubes each. Supplies heat to a 3000 litre cylinder, this heat store feeds a great main distributing to nine holiday cottages, each of which has underfloor heating a small radiator circuit and mains pressure hot water. There is an immersion heater in each cottage as backup. As this heated water is pumped round the cottages on demand, indicator lights in the boiler room show whether heating or hot water is being called for and from where.

Other provisions in the boiler room are; 

-          a high limit thermostat on the cylinder will circulate water round the heat main. This extra 200 litres is intended to cope with possible over production from the solar panels. It has a yellow indicator light on the control board.

-          A low limit thermostat on the cylinder which prevents any demand from switching on the pumps. This allows for faster heating recovery and has a yellow indicator light on the control board.

-          Within the control box there are three 6a. Circuit breakers. Two of them isolate the cottages and are in groups 1-4 and 5-9. The third isolates the boiler and its controls. This means that the boiler can be fired independently if needed or with just one group of cottages.

-        Within the control box there are two 2a circuit breakers which isolate the pump sets. Using these one or two can be selected to match the load of occupation or in the event of a breakdown, the faulty one switches off and the system will still function.

-          As mentioned above the demand from each cottage is indicated on the control panel. A blue light for DHW and red for heating and these show against the cottage number.

PROS:

-          Batch burns in intervals, meaning more cost effective

-          90% reduction of heating costs

-          Collar input reduced refuelling cycles on boiler

CONS:

-          Labour intensive

-          Large storage units required

GOOD FOR:

-          Rural farms, big estate houses

-          Large detached properties with acreage

FoFor more information on this case study or others, please call us on 01579 345018 or email sales@stoveshop.co.uk 

CASE STUDY: Four Bedroom Farmhouse

Four Bedroom Farmhouse

In a remote boiler room a Baxi Multiheat 2.5 600f boiler produces hot water for the Farmhouse. At present the fuel is wood pellets but the boiler can be adapted to burn wood chips or even grain.

An underground submain of insulted pipes connects the boiler room to the main house. Then the hot water is delivered to a 300 litre heat store cylinder containing a high efficiency heat exchange coil which delivers mains pressure domestic hot water to the bathrooms and kitchen. The cylinder also supplies a distribution system for three separate radiator circuits: upstairs radiators, downstairs radiators, towel rails and airing cupboard.

These three circuits are separately timed to allow complete control. The cylinder has a 3kW immersion heater fitted for optional use in the summer.

The cylinder also has a coil to accept input from the solar panels on the roof and the control box has a contactor to isolate the immersion heater if the cylinder temperature rises above the set point of 90 degrees. Similarly, if the cylinder is blow the set point of 40 degrees, the radiator circuits are isolated to allow temperature recovery,

The system has been cleansed, flushed and protected with Fernox F1 and filled to a standard ½ bar pressure and sealed. The heat expansion is absorbed by an 80 litre expansion vessel in the boiler room. There is a temperature and pressure relief valve on the cylinder and a pressure relief valve in the boiler room.

PROS:

-          Utilises waste sawdust from joinery and runs farmhouse plus four holiday cottages.

-          Carbon neutral

-          All future systems like this would be eligible for Renewable Heat Incentive.

CONS:

-          Labour intensive

-          Needs a large space for plant and fuel

GOOD FOR:

-          Large estate houses etc

FoFor more information on this case study or others, please call us on 01579 345018 or email sales@stoveshop.co.uk 

CASE STUDY: Barn to Boiler Room

Barn to Boiler Room

A three bedroom cottage with two bathrooms has a remote boiler room connected to the house by a heat main. This supplies two radiator circuits and a mains pressure cylinder for domestic hot water.

The boiler is a Baxi solo Innova 30 which burns logs from the owner’s woodland. One charge per day heats a 1500 litre thermostore cylinder from which are drawn the heating needs of the cottage. This cylinder is also heated by solar panels installed later as a second phase. These are able to take the place of the boiler and also generate enough to meet the needs of the cottage. 

Where the heating flow is drawn from the top of the cylinder, a thermostatic valve governs the temperature of the water. This provision ensures the safety of the household and preserves the temperature within the thermostore.

In the cottage, programmable thermostats maintain separate temperatures for upstairs and downstairs by opening motorised valves which in turn start the pump to draw heat from the thermostore in the boiler room. Thus, in this installation, the solar panels provide heating for both domestic hot water and two radiator circuits.

PROS:

-          Solar panels preheat the thermostore and reduce batch burn time

-          During the summer the solar panels create more than enough hot water

CONS:

-          Labour intensive during the winter months

-          Needs a lot of space to store logs, house equipment

-          Needs a south facing roof

-          No automation

GOOD FOR:

Rural, detached medium sized house with outside storage.

For more information on this case study or others, please call us on 01579 345018 or email sales@stoveshop.co.uk 

CASE STUDY: Detached House with Detached Boiler Room

Detached House with a Detached Boiler Room

A Baxi multiheat 2.5 (25 kW output) wood pellet boiler, installed in an external boiler house, provides central heating and mains pressure domestic hot water to a four bedroom house with three bathrooms. There is also a thirty tube solar array which significantly contributes to both the domestic hot water and central heating.

At the heart of the system is a three hundred litre thermostore cylinder which is heated directly by the boiler and indirectly by the solar through a coil at the bottom of the cylinder. 

The domestic hot water is exchanged at the top of the cylinder and passes through a blend valve to control the temperature of delivery. 

Central heating is drawn from the middle of the cylinder and uses the system water directly to the radiator circuit and a in an auxiliary mains pressure cylinder for the bathrooms. The upstairs and downstairs radiator circuits are controlled by wireless programmable thermostats.

PROS:

-          Utilises garden shed

-          Semi automatic pellet burning boiler

-          Reduced fuel costs by 60% compared with oil

-          Solar input also reduced pellet costs

CONS:

-          No pellet store close to boiler, thus labour intensive

-          Need a large, dry area to store pellets

GOOD FOR:

-          Detached town house with large garden

FoFor more information on this case study or others, please call us on 01579 345018 or email sales@stoveshop.co.uk 

CASE STUDY: Farmhouse with Boiler Room

Case study; Farmhouse with Boiler Room

In a remote boiler room a Baxi Multi Heat 2.5 600f boiler produces hot water for the farmhouse. At present the fuel is wood pellets but the boiler can be adapted to burn wood chips or even grain. A 23 metre underground submain of insulated pipes connects the boiler room to the main house. Then the hot water is delivered to a 300 litre heat store cylinder containing a high efficiency heat exchange coil which delivers main pressure domestic hot water to the bathrooms and kitchen. 

The cylinder also supplies a distribution system for three separate radiator circuits; upstairs radiators, downstairs radiators, towel rails and airing cupboard. These three circuits are separately timed to allow complete control. The cylinder has a 3kW immersion heater fitted for optional use in summer. The cylinder also has a coil to accept input from the solar panels on the roof and the control box has a contactor to isolate the immersion heater if the cylinder temperature rises above the set point of 90 degrees. Similarly, if the cylinder is below the set point of 40 degrees, the radiator circuits are isolated to allow temperature recovery.

The system has been cleansed, flushed and protected with Fernox F1 and filled to a standard ½ bar pressure and sealed. The heat expansion is absorbed by an 80 litre expansion vessel in the boiler room. There is a temperature and pressure relief valve on the cylinder and a pressure relief valve in the boiler room.

PROS:

-          Pellet prices are low; the entire central heating system is run on the equivalent of 35p of all; essentially, making a saving of 60%

-          Automatically fed boiler, not labour intensive. During winter the 35 litre lopper is filled every two days, and the ashpan emptied every two weeks. This reduces to once a week/every three weeks respectively in the summer months.

-          Carbon neutral

CONS:

-          Physical size of boiler 1200mm x 1500mm x 600mm

-          Additional cost of chimney if not already in place

GOOD FOR:

-          Rural situations with lots of space for equipment and storage of pellets.

-          Large houses

-          Unsuitable for two bed city dwellings.

FoFor more information on this case study or others, please call us on 01579 345018 or email sales@stoveshop.co.uk 

CASE STUDY: Carbon Neutral Heating

The Isles of Scilly Workshops

 This system has a 16kW Fireview wood burning stove using waste wood from a nearby joinery. This heats water for a bespoke combination cylinder made by MacDonald Engineers and to a design by Stove Shop. The cylinder has a high efficiency coil to provide mains pressure domestic hot water at up to 40 litres per minute and blended to a non scald 45 centigrade. The cylinder also provides the flow to the underfloor heating manifold which in turn supplies independently controlled heat to the four workshops.

There are automatic provisions in the system controls to prevent overheating and, conversely, to avoid the system pumping water through the floor if the fire is not lit.

Stove Shop contrusted two pre wired control boxes for the installation team to ensure trouble free connection of all the electrical components on site and guarentee that the system performed as designed.

PROS:

-          If you have access to a free fuel supply the system is very economic

-          Zero emissions; burning wood is carbon neutral

-          Eligible for Feed in Tariff if used with MCS accredited equipment and installers

CONS:

-          Labour intensive – uses a lot of fue;

-          Unless you have a free fuel source, can be as expensive as electricity

-          Large equipment is necessary

GOOD FOR:

-          Next to a building site/unit that produces wood waste

The above images were taken during construction.