The move comes shortly after E.ON introduced the new FixOnline tariff, which is only available over the internet.
E.ON's new deal means an average UK customer can save £123 a month when compared to standard UK tariff with a bill of around £1,035, the company stated.
According to British Gas, it is the UK's favourite cheap gas and electricity supplier.
The firm is also currently offering a £504 discount for anyone purchasing a new boiler before April 25th this year.
Savings come in the form of a £200 price reduction on the boiler itself, one-year of free HomeCare 200 worth £204 and a £100 saving exclusively for British Gas customers.
Click here to run an energy price comparison, and see if you could be paying less for your gas and electricity.