What is a healthy gas credit to have built up to cover the winter months? Detached 4 bed, 2 adults & 3 children. Payments approx £100 a month.
Check your usage for the same period last year and use that to estimate the cost for this year using your current tariff.
If you were in a different property last year, your monthly payment should still have been set at a level to cover usage throughout the year for your type of property.