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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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15mm or 22mm shower plumbing
Hi guys. I'm just about to install a shower pump, and being both lazy
and tight, I devised the most economical way of doing it in terms of time and money. I suspect that the fallout from this will be poor shower performance, but what the hell, the bits are ordered now. Anyway, here's the situation: cold supply from the tank in the loft to the (single) bathroom is run in 15mm pipe. The hot supply from the h/w tank to the bathroom is 22mm, but unlike the cold, this is not a dedicated supply as it feeds the kitchen also. I considered whether to buy a pump with 22mm inlets/outlets or whether to go for a 15mm fitting version. I decided that there would be less plumbing to do if I went for 15mm, since the existing cold could simply be re-routed through the pump and a new (dedicated to shower) hot drawn from the tank in 15mm pipe via a Surrey flange. This set up means that the only new pipework I would have to lay is a new hot from pump to shower (4m) and a little bit of re-arranging in the airing cupboard. I now have on order a Techflow TP60 1.8bar pump. Looking at the thermostatic shower valve that I bought, I noticed that the connections are 22mm. I am now wondering if there is any point in stepping up to 22mm pipe immediately after the pump outlets, or whether I should run in 15mm until just prior to the shower valve? Will the flow be significantly enhanced by 22mm pipe even though the upstream pipework is 15mm? I guess that the drag of water against pipe wall per unit volume of water flowing is less in 22mm than 15mm, so it should make some difference, but would it be significant enough to be worth my while (the larger bore pipe is less convenient for me to work with in the relatively confined space I have available to run it). Thanks in advance, Jim. |
#2
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15mm or 22mm shower plumbing
Will the flow be significantly enhanced by 22mm pipe even though
the upstream pipework is 15mm? It all depends on the length of pipework. For a simple shower in a normal house with standard layout, I suspect 15mm will normally be fine. However, there are circumstances in which 22mm would be better, such as long runs, panel showers etc. 15mm has some advantages too. As well as being easier to install/route/conceal, it means that the hot water becomes available sooner if the pipes are cold. Christian. |
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