What kind of boiler would be best to replace IDEAL classic RS40 (1995) piezo ignition type. It's fine at moment but being old alone and ill a lot I like to be aware of what I need if it should fail. I wish they still did this one as lived here 14 years, only had one fault, blocked pilot jet 8 years ago, local engineer came within 2 hours, stripped and cleaned everything, said never let anyone change it, he went to work for Ideal so could not do other work any more. I only use 5000 kWh a year for heating and cooker, cost under £210 a year, I use electric shower and inverter air pump air con in my bedroom. I don't fancy condenser type but understand I have no choice. I like to be prepared. 10 year guarantee prefered.