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I've got that one on my shortlist. It contains 15l of secondary water right? Does it use that bit by bit to suppliment, or all in the beginning? My notes say 0.75 bar to give the full quoted 15l/m which makes it pretty efficient in theory on a less powerful supply. The WB isn't faring to...

Those are some great technical explanations! If you struggle with those, I have some higher level explanations: As above, the flue gas contains water moisture and normally exits at high temperature. Anything at temperature contains thermal energy. The principal is to extract some of this...

One of these looks techincally ideal for our purposes including the siting as we currently have a floorstander and a space in just it's right size. Wall mounted boilers seem to be a slight issue in that we seem to have downpipes or soil pipes or other things stopping the natural places in the...

I may want to add a smallish accumulator to my mains water supply just to bolster the dynamic pressure for showering with whatever mains pressure DHW solution we end up with. I was thinking 60 or 80L of water should be more than enough as this should recharge between showers (we're getting...

When I had a pump problem, I wired mine up seperately to see if it would run independantly. I'm not suggesting you do this if you're not competant enough with electrics to do it. It enabled me to see that the pump itself was faulty and non of the other electrics - as it was the first night...

Just an update for what it's worth. The plumber was tied up and got here too late to do the work yesterday. :roll: So, I just bought the bits myself including a pressure gauge to take some readings. Before the work: 14l/m at the bath tap (fastest flowing tap and close in height to the...

You're right - the plug has a slot in it so you can take it out with a screwdriver. It's only there to protect the seals underneath on the push fit connector. To connect your supply, simply push copper or plastic pipe firmly in and then pull back a little (for most push fit's) to lock it...

I like that - how true. Yes, an accumulator is probably above the beer money threshold. :? We've currently got a nice reasonably powerful pumped shower set on a concrete isolation platform so no noise issues really there. The problem we've got is that in order to get the best space in...

All I really wanted to know was; If the flow/pressure/dynamic pressure isn't up to what we'd like it to be and we can't use a cold water storage tank and assuming we don't fit an accumulator... What option gives the best performance for the water supply we feed it. Obviously they all...

Er, nope. Just trying to understand the logic - not trying to be offensive, sorry if it came out that way. Not really, I realise I need dynamic pressure. Actually, I know a couple of them with degrees, one with a masters... true, not all the ones I've met have been so educated but there's...

Thanks Tony I haven't missed the point, I'm well aware of this - I did actually mention this was going to be done. The open pipe flow test was done because if I use something which doesn't restrict flow e.g. some unvented's or thermal stores this is the flow I'll get. Flow on a restricted...

Does that include a stopcock of the wrong size? I thought that a 22mm stopcock (or pipe for that matter) will flow around 2.3x the water than a 15mm at the same pressure.

Thanks Chris Yes, I'm aware that that's not enough for anything mains fed. I've spoken to the engineer who'll probably be doing the install for us and he's going to replace that 15mm stoptap with the correct 25mm version after which we'll see where we stand. Pressure in the area is apparently...

Yeah, that sounds like the WB engineer said when he came to check the install. Of course, WB's pre sales pretty much said 19 in, 19 out on several occasions speaking to different people (but at lower temp than the 35c rise). I should have known really, they couldn't tell me why I should buy...

I'm sooo envious! I normally get the cold shower just after my wife gets out in the morning - still on a gravity fed grade 4 cylinder at the mo but that's part an parcel of the same problem. It takes about 90 mins to heat and I was going to upgrade and go to fully pumped before we thought a...

Thanks DD - are you saying that normally if it's rated to e.g. 20l/m and that it only requires a 20l/m feed to achieve that? What seemed to happen with the last one we had was we fed it 19l/m, it was rated at 14.7l/m but we only got 11l/m - on top of which the installer and 2 WB engineers...

Hi - sorry for long post but it's better to have all the facts up front right? :lol: We are planning to convert out loft which means I have to rethink our hot water supply options. For getting rid of the tanks and therefore gaining the most space, a combi seems the most obvious choice. I...

lol - it's TOO LATE NOW!!!!! :lol: Fitted a pump about a week ago. I suspect she'd not have liked the thought of me carving up the wall anyway. :wink: Strange though, I shopped around all over the web and different places looking for the right thing, obviously I wasn't asking the right...

I'd have gone with one of them except my wife wanted to be able to move the head vertically and I couldn't find any to do that. :roll:

Sorry, I don't know the answer to that one. I'm familiar with their purpose and how they work but I'm not a plumber/heating engineer by trade so haven't had much practical experience. If it's got isolator valves on each side then I expect you can replace without having to drain down the...