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Installing a Mixer Shower from a Combi Boiler.

I have just moved into a house which has a Worcester Combi 24CDi Boiler. I do not have any Manuals or Technical details about this Boiler. I want to install a seperate bath shower complete with a Thermostatic Mixing Valve. (Possibly a Mira Excel Concealed). Will this Boiler be able to provide sufficient hot water to fully compliment this type of shower ? ie. at full flow will the water be hot enough? What technical details associated with this boiler should I need in order for a Shower Supplier to match up a suitable Mixer set up.

Research, Knowledge and Information :

Shower Install - Combi Boiler | DIYnot Forums

My plumber friend informed me that the hot / cold water pressure didn't look enough to run a mixer style shower direct from the hot / cold supply. We...
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How to fit a shower | Help & Ideas | DIY at B&Q

But remember that you can't connect a pump to a combi boiler or a cold ... How to fit a shower mixer ... So it's well worth thinking about installing an ...
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How to install a Mixer shower - MyBuilder

Dear gps1978, First thing of all is what type of boiler do you have, if it is a combi you can quite happily fit a thermo mixer no problems at all,
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Just had a combi boiler fitted , pressure too high for shower ...

if its a pumped power shower it should have been removed when the combi boiler was installed ,much better to replace with a thermostatic mixer shower
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Ispira Installation Guide - Arta Thermostatic Bath/Shower ...

Oct 19, 2011 · ... perfect for combi boilers, ... Ispira Installation Guide - Thermostatic Shower Valves ... 3:26. INSTALL THERMOSTATIC SHOWER MIXER - Duration: 5 ...

Combi boiler thermostatic mixer shower | DIYnot Forums

I,m looking at installing a thermostatic mixer shower to bathroom. Combi boiler is in loft & water takes ages to come through hot.(has always been like...
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Showers with a combi boiler by Proplumb - YouTube

Nov 15, 2013 · A little bit about why a combi boiler is so popular when it comes to the water supply for a shower.

Installing thermostatic mixer shower- please help | DIY Forums

Hi, I am planning to install a thermostatic mixer shower. I have a combi boiler. Is it advisable to make a T-joint in the hot and cold water filler...
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Combi HP Thermostatic mixer shower - Triton Showers

Combi HP Thermostatic mixer shower ... IMPORTANT: Before installing with a gas instantaneous water heater, ... Mixer valve Boiler
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IF I have an existing combination boiler ... - The Shower Expert

IF I have an existing combination boiler can I install a mixer shower ? It depends if your boiler is fully-modulating or step-modulating as far as showering is ...
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Suggested Questions And Answer :

Installing a Mixer Shower from a Combi Boiler.

Hi there, your boiler will perfectly match the mira excel ( a great choice i might add) a 24cdi will give about 9.8 litres a minute flow rate hot water. The mira excel is suitable for any plumbing set up and there installation instruction are very well laid out & their helpline is fantastic. The hot water will fluctuate accordingly to the time of year as the cold water temp coming into the property will vary. but the boiler will modulate to compensate.So in brief in the summer you will notice it hotter than you would in the winter, this has nothing to do with the boiler just the incoming temp of the cold water. Kindly Richie
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We have had a Mira shower 723 model which worked on low pressure. Now we have had a combi boiler installed and our shower cartridge changed to suit the high pressure. after much re calibrating of the

Check it is still connected to the cold supply!
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Combi -boiler tripped out by shower use

Have someone check the minimum gas rate. its probably the air/gas ratio needing setup for low flame
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Remove centre cap with flat edge. Remove screw in center of exposed hole. Gently and slowly pull dial off center teeth. It will be hard to remove but you must do it slowly so that you do not loose the position. Gently slip the dial back towards the cold direction. One or two teeth should be enough. Now reassemble and try. If it is colder you went in the wrong direction. If it it hotter congratulations. If it is to hot. Repeat the process and then go back a tooth.Hope this helps.
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Mixer shower connected to combi boiler running hot and cold and also not much pressure

Mixing valves usually have a diaphragm inside that keeps the hot and cold separate. If the diaphragm is old it may be allowing the hot and cold to mix improperly at the back of the valve. This is similar to a cross connection (a hot water line tied into a cold line) in your plumbing. Cross connections interfere with the performance of Combination Boilers and Tankless Water heaters due to their having no water storage or a very small buffer tank. The brand of the valve will help as each one is different in their mechanical design. If this is the problem you or a licensed plumber can replace the cartridge in the valve. Refer to your valve's owner's manual for part numbers.
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