When my horribly inefficient 20 year old boiler packed in I decided to investigate a replacement. After seeing his reviews I dropped Alec an email on a Sat morning and within hours he was round to inspect and discuss the options. He and his colleague Marco are clearly not only experts in their field, but have a passion for doing things the right way, and take pride in good results. As promised he emailed a quote later that day, and we decided to proceed. Alec and Marco were on site for around 3 days installing the new boiler and cylinder. They're both an absolute delight to work with, and show great consideration and care. When the job was finished, they left everything neat and tidy, and Alec followed up with regular emails to see how the new boiler was performing. The Viessmann boiler they installed has a feature called weather compensation which I'd not previously known about. A temperature sensor outside the house allows the boiler to react to changes in weather before they become obvious indoors. It does this by adjusting the temperature of the water flowing around the radiators, rather than turning itself off and on. What this means is a wonderful consistency in temperature, rather than stop-start old fashioned approach. Apparently this has been in German building regs for over 30 years. Madness that in the UK this technology is unheard of, when elsewhere it's compulsory! I would recommend Alec, Marco and weather compensation without any hesitation.