Some entrepreneurial solar installers in the Uk have realised how lucrative this tariff is and acted. They have realised that they can afford to give away a home solar system, install it and maintain it for 25 years and make money.
This is an important question but you need to know what kind of answer you are looking for. electrical contractors should have general liability insurance to cover them for any damages he may cause in your home. If the contractor has his own employees he should have workers compensation coverage as well.
If you live in a sunny area, you could generate your own energy. Invest in PV cells and have a professional install them on your roof. You should have your needs in electricity assessed by a professional to make sure your solar installation will provide enough power for your home.
Financial plan - Your budget actually comes first. No? Whether it's a plumber or an electrician or a gardener or a gardener or a pest controller or painter, make sure that "estimate" given to you and make sure it is well within your budget. Keep a supply of 10%25 of its budget for the possibility of an increase in the total.
The purpose is to break the electrical circuit when too much amperage demand is put on the circuit. This will normally happen when you have too many electrical appliances running on the same circuit at the same time.
Lastly, you'll want to make sure that your electric home wiring is up to handling large power draws. If you have an older home with outdated wiring, you'll want to upgrade that wiring before installing an electric on demand water heater.
Checking Documents: Make sure the contractor has all the required documents. Do not just believe that he does. He should own a license that allows him to work as a contractor, have bonded in some states, workers compensation insurance and general liability insurance. You should also check the Better Business Bureau to make sure the contractor or the company is legal. You can also Google the company's name to see if anyone has anything to say about them.