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.
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Re: 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.
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Do you mean that no hot water is reaching the shower, or do you mean that no hot water is coming out of the shower. The answer to this will determine where the problem is.
If no hot water is reaching your shower, then there is probably a problem with the boiler or the pipe is blocked. You can easily test this. You can turn on other faucets in the bathroom to check whether any hot water is reaching those.
If the problem isn't with the boiler and the shower is in fact receiving hot water, then the problem will be with the shower mixer valve, specifically the thermostatic cartridge. The cartridge controls water temperature. The inner workings of the cartridge move up and down to adjust the amount of hot and cold water entering the cartridge. If it has seized up, the moving part can get stuck in a certain position. It sounds like this could be the case with you and therefore replacing the cartridge should in theory fix the problem.
could be a number issues 1 the hot and cold water supply going to shower could be of unequeal pressure thus the fluctuating 2the heat exchanger in your boiler is conjested with debris 3 the gas bed in boiler is cross burning giving an unbalanced "heat pick up"out put !2 &3 would apply if your on a combi boiler system .if your on a conventinal system you could be pulling air from the head of the cyclinder ,
Check the hot water flow at the shower - if it's as good as other taps the boiler diverter valve is suspect. Replace either the complete valve or the internal rubber diaphragm, depending on the boiler make
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.
If you are having trouble only at the one fixture (shower), and no where else, the problem is most likely in the shower valve...which either needs new cartridges, or a complete replacement.
hope this helps