High-performance energy control systems for maximum performance from solar collectors and other renewable and non-renewable heat sources.
Around 85% of energy consumption in buildings is for water and space heating. With gas, electricity and oil prices rising increasingly steeply, a state-of-the-art EFG Energy Optimising System from Construction Resources can make large savings on energy costs and at the same time improve comfort. These savings will apply for any fuel, but they will be multiplied if solar collectors are included in the system, and even more, if low-temperature in-wall and under-floor heating is used instead of radiators.
- Energy savings
- Suits domestic, commercial and public buildings
- Mains pressure domestic hot water at a constant temperature
- Provides two heating circuit temperatures, low and high
- Integrates conventional boilers with solar-thermal
- Add other renewable heat sources to suit
- Fully factory assembled, exceptionally easy to install
EFG Energy Optimizing Systems are flexible and completely modular. Fully factory assembled, pre-wired and pre-tested, they are reliable, durable, and “plug and play” – exceptionally easy to install. They will maximise the effectiveness of any type of heat source, whether renewable or non-renewable, and will optimise the production of domestic hot water and the distribution of any form of central heating (or cooling).
An EFG system is modular and consists of a number of components:
- a stratifying heat store
- a module that produces domestic hot water
- one or two modules that distribute central heating around the building
- one or more modules to bring in heat from up to 3 heat sources
- a wall-mounted system manifold on which these modules are fitted
- a user-programmable computer-based controller that links all these components together and regulates their operation.
SpeedPower stratifying heat store
The core of an EFG system is a SpeedPower stratifying heat store. This is a very well insulated steel cylinder, big enough to store all the heat that solar collectors can produce. It also acts as the central store for heat produced by any other heat source attached to the system, whether running on renewable or non-renewable energy.
The heat store contains only heating water. Its patented stratifying input system ensures that the hottest water is fed into the top zone of the store – to generate domestic hot water on demand – and is not simply mixed together with the lower-temperature water lower down.
Keeping the stored water stratified by temperature is central to the performance of the system. Also important is keeping the water hot as long as possible – long enough to cover 2 or 3 days without sunshine. The SpeedPower heat stores are fitted with a 100mm layer of super-performing melamine-resin insulation, which is 40% more effective than 100mm of standard insulation.
Heat sensors attached below the insulating cover constantly communicate the water temperature in different zones of the heat store to the system controller.
SpeedPower heat stores come in 3 standard models for normal domestic use: SPS 800, SPS 900, and SPS 1000, with capacities of 800, 900 and 1000 litres respectively. Multiple heat stores can be connected together in parallel if greater capacity is required. Larger single heat stores are also available to special order for bigger installations in buildings such as schools, hotels, sports centres, offices, etc
The standard heat stores are all 990mm in diameter including insulation, so for installation they need an opening at least 790mm wide. The insulation cover is clipped on once the cylinder is in position. The 3 models are 1900mm, 2070mm and 2210mm high, and stand on the floor. All inlet and outlet pipes are aligned on one side of the cylinder to allow an easy, tidy installation.
An expansion vessel must be fitted to the heat store, with 1/10th of its capacity.
EFG domestic hot water module
For maximum user comfort and safety the EFG domestic hot water module generates hot water instantly, at a constant flow rate and at a constant temperature chosen by the user. Since the module operates at mains pressure, no expensive booster pumps are needed for showers or baths.
No domestic hot water is stored in an EFG system. Instead, a modulating pump and a high-efficiency stainless steel plate heat exchanger inside this module produce hot water only when required. When a hot tap is opened, fresh cold water from the main is pumped through the module’s heat exchanger, where it is instantly heated by hot heating water pumped from the top of the heat store.
The top 250-litre zone of the SpeedPower stratifying heat store is maintained by the system controller at whatever temperature is required to generate the domestic hot water. The system controller minimises the use of non-renewable energy by only switching on a back-up heat source (a gas condensing boiler, for example) if there is not enough solar or other renewable heat stored at the temperature needed to generate the domestic hot water.
To minimise energy use, the user can set different hot water temperatures for different times – for example 55°C from 6am to 11pm, but otherwise only 35°C.
An important special feature of the EFG domestic hot water module is protection against legionnaires’ disease. Legionnella bacteria multiply in water stored at between 20°C and 50°C, in such areas as domestic hot water systems and cooling towers. They are transmitted via aerosols – the inhalation of mist droplets containing the bacteria. Some people die from legionnaires’ disease in Britain each year, and many others suffer serious adverse health effects: the elderly and people with a compromised immune system are particularly at risk.
By not storing any domestic hot water and producing it only instantly on demand, from fresh mains water, the EFG system removes any risk of legionnella infection. In other systems where domestic hot water is stored, it needs to have the risk of legionnella eliminated by expensively heating the whole cylinder to between 70 and 80°C (158 to 176°F) to disinfect it.
To avoid any risk of lime-scale building up in the heat exchanger, the EFG domestic hot water module is positioned on the floor. This means that after each heating cycle fresh cold water flows into the heat exchanger, protecting the plates from the risk of scaling if left standing in hot water.
EFG heat output module
The EFG heat output module takes heat from the SpeedPower heat store, mixes it to the correct temperature, then pumps it around a central heating circuit. It is designed for quick and easy installation and reliable operation.
This universal output module can supply heat at any temperature required to any form of heat emitter, whether in-wall radiant heating, under-floor heating, skirting heating, ducted channel heating or conventional radiators. It can also distribute heated water to a pool or jacuzzi.
When required, if can also distribute cool water to a ceiling cooling system, or a wall heating system switched to cooling during summer. Other applications include feeding a drying installation, a heat or cool store, an air heating system, or a soil-warming system in a greenhouse.
The heat output module contains a modular circulation pump, a special 3-way mixing valve, a motorised valve with 2-minute opening and closing time, 2 shut-off ball valves with integrated thermometer gauges, a compact pipe-work system, and connectors for direct mounting onto an EFG wall-mounted system manifold.
The module comes fully assembled, wired and factory-tested in a two-part insulating cover.
Flow and return temperature sensors are ready-mounted inside the module. Pump and mixer valve power cables and both temperature sensor cables are terminated with the appropriate plug to fit directly into the right socket on the system controller. All cables are 7 metres long. An adjustable thermostatic room control for wall mounting is supplied with the module.
The EFG heat output module is available with 4 different maximum output ratings: up to 25kW, 40kW, 60kW, or 80kW.
EFG heat input module
The EFG heat input module feeds heat into the SpeedPower stratifying heat store. It is designed for quick and easy installation and reliable operation.
This universal heat input module can connect the heat store to any type of heat source, whether wood, gas, oil or solid-fuel boiler, fireplace or stove back-burner, heat-recovery ventilation system, heat pump or CHP combined heat and power system. Boilers may be with or without return circuit boosting.
The module contains a modular circulation pump, a special 3-way mixing valve, a motorised valve with 2-minute opening and closing time, 2 shut-off ball valves with integrated thermometer gauges, a compact pipework system, and connectors for direct mounting onto an EFG wall-mounted system manifold.
This heat input module is fully assembled, wired and mounted in a 2-part removable insulated cover. It is tested hydraulically and electrically in the factory.
A return temperature sensor is ready-mounted inside the module, and an operating temperature sensor is supplied for reading the internal temperature of the heat source. Pump and mixer valve power cables and both temperature sensor cables are terminated with the appropriate plug to fit directly into the right socket on the system controller. All cables are 7 metres long.
The EFG heat input module is available with 4 different output ratings: 25kW, 40kW, 60kW, 80kW.
EFG solar heat module
The EFG solar heat module feeds heat into the SpeedPower heat store from an array of solar collectors of up to 80 square meters. It is designed for quick and easy installation and reliable operation.
The water pumped through the solar collectors needs to contain anti-freeze in case of low winter temperatures, so it has to be kept in a closed circuit. The solar heat module contains a high-efficiency flat plate heat exchanger which transfers the solar heat from this closed circuit to cooler water pumped in from the SpeedPower heat store.
The module is made up of 3 insulated sections, supplied fully assembled and factory tested for direct mounting onto the EFG wall-mounted system manifold. The upper section contains the circulation pump and flow and returns temperature gauges for the solar circuit.
The middle section contains the stainless-steel flat-plate heat exchanger.
The lower section is identical to the EFG heat source module and contains a modulating circulation pump, a special 3-way mixing valve, a motorized mixing valve with a 2-minute opening and closing time, 2 shut-off ball valves with integrated thermometer gauges and compact pipe assembly.
The solar heat module comes fully wired and electrically tested. As well as the ready-mounted flow temperature sensor, a solar radiation sensor is also included for outdoor mounting, to display the current solar intensity. Power and sensor cables are 7 meters long.
A safety, isolation and flushing kit operating at 3 bar is included as standard with this module. This includes a connector for the high-temperature expansion vessel (not included) which is required for the solar circuit. A 6 bar version of this kit is also optionally available.
EFG system controllers
EFG system controllers are computer-based units that provide weather-compensated regulation for EFG domestic hot water and central heating systems and allow the user and installer programming of all system parameters.
All the temperature sensors in the system plug into the controller, and it regulates all power output to pumps and valves. If there is a boiler in the system that can be switched on and off, it is the system controller which will do the switching.
The user interfaces display panel on the controller allows the user to change any of the default settings in the controller for of variable operating times and temperatures for the components in the system.
As with all other elements of the EFG system, the controller is set up to give maximum ease and reliability of the installation. All sensor cables from the EFG system modules are pre-fitted with individually numbered plugs that fit into the correspondingly numbered sockets on the controller.
System controllers are available for a range of different heat sources, and one or 2 central heating circuits. The heat sources fall into 3 categories, indicated by the letter N, R, or S in the table below, where N indicates a non-switchable source, R a source that can be regulated, and S solar collectors.
|Controller N-1S||non-switchable boiler + solar + 1 heating circuit|
|Controller N-2S||non-switchable boiler + solar + 2 heating circuits|
|Controller R-1S||switchable boiler + solar + 1 heating circuit|
|Controller R-2S||switchable boiler + solar + 2 heating circuits|
|Controller R-1||switchable boiler + 1 heating circuit|
|Controller RN-1S||switchable boiler + non-switchable boiler + solar + 1 heating circuit|
|Controller RN-2||switchable boiler + non-switchable boiler + 2 heating circuits|
EFG system manifold
The EFG system manifold allows fast, neat and professional installation of an EFG heating system. The manifold is fixed to the wall and supports the system’s hydraulic modules, which connect directly to the connectors on its top. Connectors on the bottom handle the flow and return to the heat store. Only the domestic hot water module stands directly on the floor, with its own direct flow and return connections to the heat store.
The 4 different manifold sizes allow from 2 to 5 EFG system modules to be connected directly to the upper system connectors, and a SpeedPower stratifying heat store to the lower system connectors.
The system manifold consists of 2 thermally separated steel distribution channels. Non-contiguous pipes, each with aluminum-encased polyurethane insulation, are fed through to the appropriate channel from the flow and return connectors. 2 strong mounting brackets (supplied with all fixings) allow the manifold to be securely fixed to the wall.
The manifold is pressure-tested in the factory. Internally it is untreated, externally it is coated.
EFG System manifold dimensions:
|Number of modules||width mm||height mm||depth mm|