My (original)tube has just failed after just under 12 months, but as I expect I may be made redundant shortly I want to avoid purchasing a premium Jewel replacement tube. I remember reading of someone using budget tubes successfully. Does any body know any source of budget tubes and may they be standard from an electricians store? Post code SK23 My instructions (PDF) say only a ref No 47350 (UK), but no length or wattage. The tank is 400 litres and is 5 ft long Any help appreciated.