gledhill boilermate ideal

Hi All We have a boilermate 2000 and ideal classic boiler looking to have it changed. House is 3 storey 6 bedroom 2 bathroom 15 radiators. Had a plumber give us a quote he had advised us to rip out the boilermate and just replace the ideal classic with a Ideal Vougue Maxi 40 kW Combi just...