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hmm OK, I'll do the calc tonight and get a true Kw figure :) The specs I have on the boilers don't list a Max output for the system boilers, only the combi's. The cost difference between the boilers is only about £50 between each range. I assume the running costs could be a lot higher...

Looking at another thread a popular method of calculating required output was to take 5000 per room and add 15000 for hot water. If I apply this to my house it's 15 rooms (plus hall/stairs/landing, does that count?) so 90,000Btu/h. Does that sound about right? Looking at the Vaillant range...

So you'd go with a small boiler and a larger tank? I've not done any calcs yet, I'll get the room sizes etc.. later today and see what it comes out at. I doubt very much we'll have all 21 rads on at once! You never know though, that one time a year when you have guests over at xmas...

Replying to my own message, how sad :) I forgot to mention that the house is an Edwardian detached over 3 floors. The 'kit' will be placed in the cellar driving approx 21 rads, 1 bathroom, 1 downstairs cloak, 2 ensuits (1 without shower). There are only 2 people living in the house...

My first post here after many months of 'lurking'! I need to order a 35-40Kw System Boiler and 210l Unvented Cylinder for a large house that I've recently bought and am in the process of renovating. Would any of you have any advice on the best combination of the two? I've seen a Vaillant...