Heating Controls Online
is rated 4.90 stars by Reviews.co.uk based on 2815 merchant reviews
4.90 / 5 Rating
Always good value and a good service
Best price, rapid delivery, slick & informative website. Q&A section for each item can be very useful, especially in terms of compatibility (e.g. take a look at the Siemens CMV322 - which I have just ordered - if you want a branded example). I've tried other suppliers, but none have even come close.