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Thanks. I'll get my plumber to come out and have a look. Don't worry not jumping in without seeing what will and won't work. The outside tap and the tap in the utility room is filling a litre jug is less than 4 seconds. Not as as good as my last house but seems ok.

It would definitely be an unvented cylinder! I want good pressure hot water throughout the house. As the boiler is so new it would be a shame to take it out.

I haven't tested the pressure yet. We just moved in a couple of weeks ago. We might need a goo check of what's there before jumping in. I think I'm coming around to keeping the existing boiler and getting a cylinder next to it if possible.

Thanks or this. Thinking of 'making room' for an unvented cylinder in the garage. That keeps it all in one place and hopefully gives good pressure hot water in the house. Would the 18KW be ok for 250 l tank?

I looked at that but thought I needed the room. However, it might be a neater solution as all in the same place. I guess the next question is, is the current boiler (heat only boiler) ok for the unvented cylinder. Would 18kw be good enough for a 250l tank?

At the outside cold tap around 15 litres a minute. I’d imagine that should be ok for the combi. The boiler is working fine. I guess if I kept it and went with thee new cylinder, I might be (not confirmed) spending a couple of grand on something which might be moved taken out when we extend. I...

Thanks for the reply. I haven’t got an actual measurement of the pressure yet but it does seem as though it will be fine. Plenty of pressure in the kitchen and outside taps. This was option C. I will get the plumber to check it out though before making any decisions. I guess the main question...

Hi, I’m looking for some advice on whether to get a new combi boiler or keep our current boiler and get an unvented cylinder. We have just moved in to a new house. 1930’s dormer bungalow and a a gravity fed vented hot water tank (in the loft). The boiler is an Alpha CD18R (18kw). This is in...