Unfortunately a poor company to deal with and one I regret making a purchase from. The install went as planned and boiler was working well until I noticed a knocking sound coming from the boiler. The manufacturer came out to repair the boiler under warranty and reported the electrical installation had been bodged as you can see from the pictures. So Heatable sent around another engineer to rectify the bodged install, this is when the nightmare started. The engineer who came to rectify the install was really poor. I arranged over the phone with him to come in the morning, 2 in the afternoon I called to see where he was and Heatable called back to say he would be another hour. 3 o'clock he called me to say he would take another hour. So a whole day wasted waiting for him. The engineer then spent two hours doing, I'm not sure what. He shouted upstairs for me to turn on the thermostat which I did and the electric tripped out in the whole house. He then spent another hour doing, I'm not sure what, then asked me to turn the thermostat on again and the heating came on so he left. Later I tried to turn the heating off and realised I wasnt able to and the thermostat was unable to control the heating/boiler. So over the next few days Heatable sent more engineers around to see what the issue was. It wasn't an issue with the boiler so passed me on to Nest. During my calls with Heatable they insisted even though I hadn't purchased the Nest Thermostat through Heatable, if one of their engineers had broken it they would replace it. Nest where unable to fix the Thermostat and couldnt replace it as the warranty had expired and as you might guess when push came to shove, Heatable washed their hamds of it and told me their was nothing they can do and it wasn't their engineer who had broken it. I just can not belive that it is a coincidence the Thermostat stopped working at the exact same time their engineer wired it up incorreclty and the electric tripped out in the house. Anyway even more infurating I have now purchased a brand new Nest Thermostat and paid someone to come and install it. They have just opened up the case and shown me inside and the only change to the bodged install they have made is to change the brand of wago connector. The original wiring on the £2.5k boiler has been hacked up beyond belief. Please take a look at the manufactorers report and these pictures and DO NOT purchase a boiler from Heatable