Take this advice from a suffering customer of Glow Green. Stay away from this company unless you have all the time on your hands to be making on average 10 calls per day over 1 week period on all 3 telephone numbers provided on the website and still NO ONE ANSWERS THE PHONE CALLS. I bought a very expensive bolier through them and it's been the worst mistake I have made in my life.  The bolier had issues which needed an engineer to come out but to get this Worcester engineer to come out, it took 3 weeks because that's how long it took me to get through to someone to arrange the engineer call out. I now have a Nest thermostat issue that I also bought through Glow Green and I have been promised an engineer will call me to sort this problem out and currently I am still waiting and this has been now the 3rd week and still no contact made.  I promise you I have never in my 40 years dealt with a unprofessional, bad serviced, lack of staff, incompetent company like Glow Green. The do not care about customer service and after sales care and I am the one one that is suffering in silent. Young children in the house and having the thought of the bolier not working during winter is giving anxiety as it takes on average 3 weeks to get through to someone in Glow Green. Please take this review seriously, STAY AWAY FROM GLOW GREEN and dont be like me, who spent all that money to be left as a sad disappointed let down customer.