Is it cheaper to leave the immersion heater switched on ?

Is it cheaper to leave the immersion heater switched on ?

Blocked Drains – Various Tools Used Plumber – Aspects Of Kitchen Plumbing Leaking Taps – How Repairs Are Done Plumber – Dealing With Leaking Roofs Plumber – Emergency Services Offered Plumber – Solar Hot Water Systems 4 Reasons Homeowners Need…