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Old 10-19-2011, 02:52 PM   #1
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shower not hot enough


Ok...I know I'm a lady, but I have a serious love of DIY... and I have a problem with my shower that I can't get my head around... I have a combi boiler, a shower that is ok with a combi boiler...but it just doesn't get hot enough. even with the tap turned to full I get a very luke warn shower. Is there an inhibitor on the tap? or is it a combi problem. Shower one has one tap... you know the kind...turn right for hot, left for cold and a lever for turning it on. It's almost like the cold water is coming in too quickly, but I'm not sure what to do... I've tried turning the cold water tap on in the sink while at the same time have a shower, didn't make any difference....Help please.



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Old 10-19-2011, 03:15 PM   #2
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shower not hot enough


Could be the balancing (hot/cold) on the valve itself. Need to remove handle and then finish piece covering the valve. Look for 2 slotted set screws that are like separate hot cold faucets. Open the hot a bit more.

Is this a new condition or new valve?

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Old 10-19-2011, 03:45 PM   #3
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shower not hot enough


will have a look...when there is another adult in the house!!!...thank you
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Old 10-19-2011, 06:24 PM   #4
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shower not hot enough


What exactly do you mean when you say you have a "combi boiler". Is this a wall-hung unit that provides space heating as well as tankless, on-demand domestic hot water?

If it is, then the installer should've installed a flow restrictor (or valve that can be "throttled down") in the cold water line that feeds into the tankless coil. If the volume of water through the coil is too great, the unit will not be able to heat it adequately. This often happens with showers, because the flow is much greater than with a sink, for example. The unit may have no difficulty at all supplying hot water to a sink because of the smaller diameter connectors (under the sink), and aerators/flow restrictors on the spouts.
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Old 10-21-2011, 06:03 PM   #5
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shower not hot enough


thanks Ishmael A combi - combination boiler, no water tank...that sounds like what is happening. Is this something an amateur could do? I am currently redesigning/decorating the kitchen (which happens to be under the bathroom) the ceiling is waiting to be plastered so at the moment I can reach the cold water pipe from underneath...not possible from the bathroom as the floor has been tiled. I have basic knowledge and will give anything a go, tools not a problem (as long as I know what I need before starting!!!) and I know where the stop cock is...lol

thanks for you help
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Old 10-21-2011, 06:24 PM   #6
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shower not hot enough


You won't have to do anything to the pipes feeding the shower. Depending on what's causing the problem, you'll either be working on the shower valve itself, or the domestic water piping right at the boiler.

Posting some pictures of the shower valve and the boiler would be helpful.

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