With rising energy prices it’s not surprising that many people are looking for efficient ways to heat their homes, and reduce their fuel costs.
So what is the cheapest and greenest way to heat your home?
Mains Gas, if available in your area, is likely to be the cheapest and least polluting conventional fuel to choose – providing you have an efficient condensing boiler. Always make sure you’re on the most completive energy tariff too.
Electric heating, whether by storage heaters or portable electric fires, is the method that produces the most CO2 emissions, and also the most expensive option, see Sust-it’s electric heater calculator.
Switching to a green renewable electricity supplier is one of the quickest and easiest ways to reduce your home or business CO2 emissions. Green Choices does not have the resources to maintain an up-to-date list. However, Sust-it provides a free and impartial energy search engine to compare green and renewable electricity tariffs.
Oil-fired boilers have improved in efficiency, but oil prices, like other fossil fuels, can fluctuate greatly. Although bio-oils and biodiesel are starting to be developed, they are not yet widely available.
So whilst renewable energy might once have been seen as a quirky options for some, with the Governments push for feed-in-tariffs, it has become more viable. Although still only if you’ve got the funds to invest in the first place
But what alternatives are there to the traditional central heating boiler,
Best described as a reverse fridge, heat pumps take heat from the ground, air or water, and use an electric pump to boost it to the right temperature to keep your house warm, and sometimes also for water heating. Initially manufacturers claimed you could get four unit of electricity for every one you put in, but this appears to have been over ambitious. A good performing system, properly set up. should give at least three units of heat for each unit of electricity used by the pump. And yes they work when the ground is frozen. They work best in well-insulated houses off the mains gas network, and can give significant savings for people who currently heat their house using electricity. But gas isn’t available in all areas.
Ground source heat pumps need lots of space, as pipes are buried in trenches of 1.5+ metres deep. As a rule of thumb you need twice the area of the property you want to heat to lay the ground pipes. Water source heat pumps you need a nearby lake or stream or a well if you are lucky enough to have one handy!
Air source heat pumps attach to the outside wall of the building, and look similar to the fans on air conditioning units.
Micro Combined heat and power (CHP)
It’s early days in the development of domestic CHP’s. It is a way of generating heat and electricity simultaneously. Designed to replace domestic boilers it is fuelled by gas and generates electricity as a bi-product. For this reason, not everyone would consider it a renewable technology. Micro-CHP is significantly more expensive to install than a gas boiler, and so take-up is slow. The first 30,000 people to install CHP will be eligible for the feed-in tariff for a period of 10 years.
For domestic heating purposes, biomass to mean wood in the form of logs, wood pellet or wood chip. Unlike most renewable technologies which, use elements such as the sun or wind for power, there is an ongoing fuel cost with biomass heating. They also need more space. The boilers tend to be larger than the equivalent gas or oil fired one, and you will need about 6-7 cubic metres of storage for the fuel for an average size house. Check that you have a choice of local fuel suppliers, as the cost of fuel varies according to the distance the supplier has to travel. Pellets are the most expensive, but it is possible to have fully automated feed systems. Logs are the cheapest, and need to be fed in by hand.
For water heating – Solar Thermal
Solar water heating also takes the heat from the sun, and uses it to heat water for use in the home. Like solar PV, you need a roof that faces between south east and south west – the closer to due south the better. However, for solar thermal panels you need less space: between 1 and 2 square metres per person is a rule of thumb. You also need space to install a tall, thin water cylinder with two coils. Ideally it should be big enough to hold two days water. It is possible to have solar hot water with a combi boiler, but it’s more complicated and you need to check that it accepts pre-heated water. If you use an electric shower for most of your bathing, solar thermal will not be suitable.