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Solar Thermal

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Make your property more sustainable

Generate your own hot water.

The Government Back Renewable Heat Incentive has been awarded to Solar Thermal Technology. Find out what sort of payback period you can expect.

Solar thermal hot water heating systems could help satisfy heating needs by capturing the thermal heat energy of the sun for heating hot water for use in domestic and commercial building or swimming pools.

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Quality Design

There is never a compromise on quality. We design all of our products so that you can be sure that the durability and efficiency are sector leading. We continually develop new technologies and use only the best materials to ensure our products exceed all performance and environmental standards.

Heating Responsibly

Grant manufacture heating systems that respond to the challenges of rising fuel costs whilst protecting our environment. Environmental responsibility is central to all we do and we continue to develop and innovate to produce even more efficient products that make best use of our natural resources.

Our Guarantee

The Grant label is a guarantee of reliability, quality and value. We put our customers first and our independence ensures that we can monitor our standards and processes to deliver the ver y best quality and service.

Fit for the future

With zero CO2 emissions and an inexhaustible supply of sunshine (even in the UK!) solar technology is good for the environment and is an excellent way for homeowners to reduce their carbon footprint as part of a wider lifestyle choice.

Why solar thermal?

Solar thermal is a clean and sustainable method of providing homes with hot water. As with all Grant products the technology is simple but highly efficient, providing an environmentally responsible and cost effective alternative to traditional energy sources.

The benefits of Grant Solar Thermal

All our products and components are rigorously tested to ensure the highest standards of quality and reliability and over time deliver significant cost savings.

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Free energy!

Many people believe that solar collectors only work in the summer, however this type of free energy is available throughout the year. From May to September, solar thermal could produce 100% of the energy required for heating your domestic water (see below). Grant collectors operate not just with direct sunlight, but also diffused sunlight, so they even work on cloudy days. On average Grant Solar can provide up to 70% of your hot water needs per year, for free!

82.6% Collector Efficiency

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Solar irradiation in the UK and Ireland

This diagram shows the total average solar radiation falling on 1m2 surface, inclined at 30° to the horizontal, measured in kilowatthours. The average property requires approximately3,000 kWh per year for domestic water heating.

Collector overview

The Grant Sahara collector has a durable aluminium frame with a bronze anodised finish, which has been designed to blend with most domestic roof types. During the manufacturing process, the use of premium materials guarantees the collectors’ reliability and durability. Grant collectors have been tested to the requirement of BS EN 12975 and are certified with the Solar Keymark.

Heat Transfer Technology

Grant use a unique patented system where the heat transfer sheet interlocks both the pipe and absorber for perfect thermal transfer. Additional aluminium plates enclose the copper pipes and combined with an industrial strength adhesive result in 360° heat transfer (see diagram 1). Examples shown in diagrams 2 (Soldered absorber) and 3 (Ultrasonic welded) provide far less contact, making these options less efficient and more prone to water damage.

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Design

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Solar Thermal System

Grant Solar Thermal can integrate easily with conventional water heating systems. Installation typically takes a couple of days to complete.

The pump station incorporated in the diagram above features an air eliminator that allows the system to be both filled and purged of air in a single operation. Unlike other arrangements there is no need to install an air vent on the roof and also no need for frequent maintenance.

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Solar Thermal Design

Ease of ordering

To make life as straightforward as possible, Grant have introduced a series of individually numbered kits that meet most installation requirements. These simply consist of Sahara collectors, a roof mounting system, expansion vessel, pump station, control panel, pipe connections and solar fluid.

Designing your system

Grant Solar collectors have an absorber (or nett) area of 2.14m2. As a rule of thumb, when sizing a system, you should allow 1.0-1.3m2 of nett collector area, per person.

Cylinder requirements are 50-60 litres capacity per m2 of nett collector area. To simplify this, for a 2-collector system of 2 x 2.14 = 4.28m2, you would require a cylinder of approximately 200-250 litres. This should be sufficient for 4 people and satisfy up to 70% of your hot water demand per annum.

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Solar Thermal Components

Solar controllers

The Grant GSX1 and GSD3X differential temperature solar controllers automatically manage the operation of the solar thermal system.

Expansion vessel

The Grant Solar pump station has been redesigned to make it more compact. The latest version has a black cover, housing the 3-speed high efficiency circulating pump, along with all other control components and is designed for vertical wall mounting.

Solar pump station

The Grant Solar pump station has been redesigned to make it more compact. The latest version has a black cover, housing the 3-speed high efficiency circulating pump, along with all other control components and is designed for vertical wall mounting.

Solar controllers

The solar fluid is an odour-free, non-toxic 40/60 propylene glycol/water solution, developed specifically for solar thermal applications to protect systems from freezing.

Grant CombiSOL

Integrating renewables with combi boilers With solar thermal systems increasing in popularity in the UK and many new and existing heating installations involving mains pressure combination boilers, a simple, cost effective solution to integrate these two technologies is a must.

Compatibility

The Grant CombiSOL also accurately regulates the inlet water temperature to the combination boiler, therefore installing this unit with any combi boiler should not pose a problem, as the mixed water into the appliance is limited to a maximum of 24°C.

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Technical information

The unique thermostatic change-over valves provide a safe and simple solution for adding renewable energies to the home without having the added expense of changing your central heating appliance.

It is important to ensure that the combination boiler can accept an incoming cold mains water temperature of up to 24°C. If in doubt, contact the boiler manufacturer. Grant’s extensive research and development programme has refined the use of each valve (marked clearly on the white cap) to give optimum control of hot water delivery to your taps.

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Solar Thermal Mounting Options

Roof inclination and direction

When choosing a system there are a number of factors to consider.

Almost any roof type is suitable, however a south facing arrangement could gain 100% of the solar energy available during the day. If the roof was to face south-east or south-west there will be a reduction in yield by 5-10%.

Positioning

Collectors can be positioned on the roof either in a portrait or landscape arrangement, as shown below.

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On-roof

Grant Solar collectors can be quickly and easily located above the roof tiles or slates using brackets and a mounting rail attached directly to the roof trusses. This system is available with fixing brackets suitable for all roof tile types including slates, on roof pitches ranging from 20° to 90°. The on-roof mounting system is supplied as standard with any on-roof Grant Solar kit.

In-roof

Installation of Grant Solar collectors set into the roof tiles or slates ensures a low-profile appearance. The roof surface beneath is closed within an aluminium weathering cassette incorporating flashings and drainage channels etc. In new build applications this mounting option reduces roofing costs, as tiles are not required beneath the installation.

Flat-roof

The flat-roof system is based upon the on-roof design. The mounting rails are fitted to a rigid inclined frame structure. This method allows the collectors to be positioned quickly and easily on a flat roof.

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Grant Solar Cylinder Range

The Wave range of cylinders and thermal stores are manufactured to the highest specifications. The cylinders are produced using high quality 1mm thick duplex 2034 stainless steel and the internal coils are manufactured from either 20mm or 25mm corrugated stainless steel tubing to deliver maximum heat transfer and recovery.

DuoWave Solar cylinders

The DuoWave range of mains pressure hot water cylinders were developed to meet the growing demand for systems that combine a renewable heat source with a standard oil, gas or electric boiler. They are particularly suitable for use with solar hot water systems like Grant Solar Thermal. When correctly installed this arrangement can significantly reduce the dependence on traditional fossil fuels resulting in lower energy bills.

Design

Direct models are designed to be electrically heated but also incorporate a high performance solar coil to allow easy connection to a solar thermal system. Indirect cylinders have two coils for connection to primary heat sources. The solar heat supply should be connected to the bottom coil, which is designed to preheat, or heat the surrounding water, depending on the temperature of the incoming supply. The central heating boiler connections should then be made to the top coil. The boiler will only operate if the water in the cylinder has not reached the desired pre-set temperature and the boiler/cylinder controls are installed and commissioned correctly.

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Installation and Commissioning

The installation of the Grant Solar Thermal system must be carried out by a competent trained person in accordance with the relevant requirements for health and safety, local building regulations, building standards in Scotland and regulations and bylaws of the local water company.

Comprehensive technical information can be found in the installation instructions, which is supplied with every solar thermal system. Recent changes to legislation mean that planning permission is not required on most domestic houses, unless the property is listed, or in an area of outstanding natural beauty (Regulations subject to change).

Guarantees

Grant Engineering (UK) Limited guarantees the manufacture of the solar thermal system including all electrical and mechanical components for a period of twelve months from the date of installation, unless the installation was more than six months from the date of purchase, in which case the guarantee period will commence six months from the date of purchase, provided that the system has been installed in full accordance with the installation and servicing manual issued. This will be extended to a total period of five years if the solar thermal system is registered with Grant Engineering (UK) Limited within thirty days of installation and serviced biennially. To register your boiler visit:  https://www.grantuk.com/

In addition, the collector (panel) has a performance guarantee for a period of five years (parts only) from date of installation.

Please note taht Grant UK do not guarantee mixed systems i.e. those that include parts or collectors that have been supplied by another manufacturer.

Deatiled Terms and Conditions are available upon request.

Grant Engineering (UK) Ltd

Hopton House, Hopton Industrial Estate,

Devizes, Wiltshire, SN10 2EU

t: +44 (0)1380 736920 f: +44 (0)1380 736991

e: sales@grantuk.com  w: www.grantuk.com

Aftersales Service

For peace of mind, Grant VortexBlue boilers are backed by a national network of independent service engineers. In the unlikely event of a problem occurring, your installer should telephone our Customer Service Department on: +44 (0)1380 736920.

Website Downloads

For further information about the Grant product range or to download our brochures please visit our website at: https://www.grantuk.com/

Training Academy

At our purpose built Training Academy in Devizes we offer a wide range of training courses, including Grant product training courses, OFTEC training and assessment and Logic Hot Water Systems, and Safety and Water Regulations courses. Our facilities include air-conditioned lecture rooms and extensive oil burner and ‘renewables’ training and assessment workshops. Here our trainees can hone their skills on a training roof, working solar thermal and wood pellet boilers, air source heat pumps, thermal store installations, solar thermal training/assessment rigs and unvented hot water training and assessment rigs.

The training covers all aspects of the Grant Solar Thermal range including designing and planning a system, installation, operation and key features and benefits.

For further information call: +44 (0)1380 736943

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Accreditations

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