Can anyone recommend someone who is an expert in setting Viessmann weather compensating boilers? (Vitodens 200W) Despite spending £200 a month on LPG we can't seem to get our downstairs even to 16 degrees C (a couple of upstairs rooms are warmer) so I could really do with a knowledgeable trustworthy person to come and check out where we're going wrong. I'm 99% sure the boiler isn't at fault - I think we just need some help/advice setting the heat curve and probably also adjusting the balance of our radiators. Thanks in advance!