Electrical Works & Air Conditioning

Electrical Work and Engineering

Service, Maintenance & Plumbing

Services

SGS can cover any kind of work, no matter how big or small. We pride ourselves on promoting renewable energy to save the earth's resources. Whatever the technology, we'll be up to scratch with it as all of our engineers are regularly trained and accredited. If you're looking for solar panels or underfloor heating then you've come to the right people.

Renewable Energy for Heating

Solar water heating

Many people believe that Solar water heating systems can only be used in hot, sunny climates but this is not true. Solar water heating systems need daylight and not just direct sunshine, due to using specially coated panels they can collect as much energy as possible, even on cloudy days.

Solar water heating systems can often work in conjunction with your current heating system, providing you have stored hot water in a twin coil hot water cylinder (these can usually be found in an airing cupboard).

Solar water heating systems use heat from the sun to work alongside your conventional water heater. The technology is well developed with a large choice of equipment to suit many applications.

How does it work?

For domestic hot water there are three main components

Solar panels or collectors - are fitted to your roof. They collect heat from the sun's radiation. There are 2 main types of collector:
- Flat plate systems - which are comprised of an absorber plate with a transparent cover to collect the sun's heat, or
- Evacuated tube systems - which are comprised of a row of glass tubes that each contain an absorber plate feeding into a mainfold which transports the heated fluid.
A heat transfer system - uses the collected heat to heat water;
Hot water cylinder - stores the hot water that is heated during the day and supplies it for use later.

The benefits

Solar water heating can provide you with about a third of your hot water needs. The average domestic system reduces C02 by around 350kg per year and about £40 a year of your hot water bills, depending on the fuel replaced.

Is it suitable for my home?

Solar water heating can be used in the home or for larger applications, such as swimming pools. You will need 3-4 square metres of southeast to southwest facing roof receiving direct sunlight for the main part of the day for a domestic system. You'll also need space to locate an additional water cylinder if required.

Choosing a system suitable to your needs requires consideration of a range of factors, including the area of south facing roof, the existing water heating system (e.g. some combi boilers aren't suitable) and your budget.

Air Source Air-to-Water Heat Pump

What is an Air to Water heat pump?

A heat pump is a device which absorbs free energy (heat) from the ambient air (the outside air that surrounds your house) and upgrades it to a higher temperature which can be usefully employed for heating and/or hot water. It is electrically operated, and does not need flues, ventilation, mains gas or an oil supply.

How does a Heat Pump work?

The heat pump is based on a refrigerant cycle (like your home fridge but in reverse, and basically comprises of 4 essential components.

The Evaporator – absorbs heat from renewable source (air, water, ground)
The Compressor – raises pressure hence temperatures of absorbed heat
The Condenser – rejects upgraded heat to the source inside (air or water)
The Expansion Device – reduces pressure/temperature to allow evaporation (heat absorption) at low temperatures

Benefits of having a Heat Pump

High efficiency up to 500% (5:1 COP)
Savings of 30-75% in energy consumption
Reduction of 30-75% of CO2 emissions
Water temperatures up to 55°C without supplementary Heating
No flues, no ventilation and no gas supply needed (no combustion), therefore reducing health and safety risks
Operation down to -15°C ambient temperature (-20°C with back-up heater)
Standard single phase power supply with no starting current and no power surge due to inverter control
Weekly legionella protection
Unique twin temperature settings (heating and hot water) from sophisticated controls
Simple and non disruptive installation, like a conventional boiler, with the exception of an outdoor unit.

Low Energy Heat Pumps

Here, at SGS of Salisbury Wiltshire we supply and install environmentally friendly, energy saving, energy efficient central heating systems & underfloor heating using low energy heat pumps by experienced plumbers and heating engineers.

What is a heat pump?

A heat pump extracts low temperature energy from the environment and increases its temperature for heating purposes. Heat pump efficiencies are normally quoted as the coefficient of performance of the system; these are typically in the range 3 to 5. In other words, extracting heat from renewable sources requires just 1kW of electrical input in order to generate 3kW to 5kW of heating output. Heat pump systems therefore, are 3 to 5 times more efficient than fossil fuel boilers and are more than capable of warming a house completely, even during the lowest winter temperatures.

SGS installs the Altherma energy saving heat pumps from Daikin. Altherma energy saving (or energy efficient) heat pump system is a split system consisting of an outdoor unit and an indoor hydro-box that can be connected to all standard low temperature radiators and underfloor heating systems.

Benefits of using Altherma low energy central heating systems

Cost effective alternative to fossil fuel boilers
Low energy bills
Low CO2 emissions
Easy to install
Total solution for year round comfort for heating and cooling

Low temperature heating combined advantages

Rapid progress in heating technology and improved building insulation allows water temperatures of 55ºC or less to be sufficient nowadays to heat a house thoroughly, even at extremely low outside temperatures. High levels of comfort with the added benefit of lower energy consumption can therefore be achieved due to the smaller temperature differential between the heat emitter and the room itself. Most modern water based heating systems operate at low temperatures, supplying heat via radiators or underfloor heating systems, individually or in combination.

What does Air Conditioning do?

Air conditioning is the process of treating the temperature, humidity, cleanness and distribution of the air.

Cooling

Our air conditioners offer precise temperature control. You can always create the climate in which you feel best, with the right temperature. Not only does it create comfort, it makes you feel fresh and active even in the most extreme outside conditions.

Heating

Air conditioners can also offer heating. You can enjoy the perfect constant temperature all year through, no matter what are the outside conditions. It is an environmentally friendly alternative to traditional heating because it takes energy from the outside air and brings it inside. Hence the name Heat Pump.

Cleaning

Our air conditioners produce clean, healthy air. All indoor units are equipped with filters that take dust, pollen, smoke, ... from the air. According to the needs of the customer the level of filtration can be increased. Filtration is critical for persons with allergies.

Dehumidifying

In cooling mode an air conditioner dehumidifies the air, creating a better feeling of wellbeing. Bear also in mind that a correct humidity level limits the growth of dust mites and molds, which again has a positive effect on persons with allergies. Human beings feel that 40 to 60 % is a comfort level of humidity. Also a correct humidity level ensures a longer lifetime of your appliances and house.

Ventilating

Ventilation can be integrated in the air conditioning system. It takes out the inside air and pushes in fresh, conditioned air from outside. In mid season, when the air conditioning is turned off, the ventilation can work independently. Our ventilation systems can also be installed without the air conditioning installation.

Installation

We can install any type of system from a single wall mounted unit throught to a VRV mu

Service

We can arrange for service and repair of all types of system on a one off or contract basis