The combi boiler can then deliver faster, but only for as long as the water store lasts. If this doesn’t solve the problem, then you could have an issue with the dials or a more serious internal problem. In the event that it gets stuck, you could end up with hot water but no heating, or vice versa. In this article we’ll be dealing with bringing your water temperature down safely. They may even drain the boiler is required. A combi boiler will need a flow rate of around 10 litres per minute, although some people argue it should be higher at around 12 litres per minute. If your combi boiler’s flow rate is too slow and can’t even reach its minimum requirement, then it will often cause the water to heat more than it should. It then goes cold for a while, then heats up to the temerature I set on the boiler thermostat. Any interference in this process is highly likely to affect the water temperature. Remember, a combi boiler heats water as and when it’s needed, so the results should be instant. If you are experiencing an issue with your boiler, this guide to common boiler problems may help you diagnose the issue before reaching for the Yellow Pages and calling in outside help for an expensive emergency service. A combi boiler only does one thing, and that’s heat water … The story has plenty of messages to it for one thing breaking into a bear family home and going to sleep is a bad idea! I just had a new Vaillant ecotec plus 831 combi boiler installed. Use our “Find an Installer” service to make your booking. If I try to mix it with cold water it doesn't make a difference to the temperature, unless I turn the hot water right down, but then the pilot light in the boiler … The room thermostat tells the boiler whether to pump water through the radiators or not. They work by heating water directly from the mains supply, so there is no need for a storage tank of any kind. Now we need to know what type of boiler you have. Then turn it back on again and reduce the temperature to a cooler level to see if things change. There’s no right or wrong temperature for hot water from the taps. So, while we have looked at the most common issues that could be causing your combi boiler to get too hot what should you do if the problems keep happening even after professional repairs have been carried out? Unlike lowering the temperature in a combi boiler, cylinders will take time to cool down if they are at maximum temperature already. Boiler water is circulated again and again. While they are more reliable than gas boilers, they are not always perfect so from time to time electric boiler users can find themselves with no hot water. Remember the message from Goldilocks I mentioned earlier? For combi boilers, the recommended output temperature for the radiators is 75 °C and for the water it’s 60 °C. Keep making small adjustments until you’re happy with the temperature. If your boiler it noticeably quite old or in poor condition then this could easily cause problems with the temperature. The thingy on the tank is for the temperature of the water. Well, that is what we are going to look at when it comes to combi boilers. When the boiler comes on in the morning, the radiators het hot and the temperature quickly reaches 20 degrees (one degree lower than that set on thermostat). You might need to remove a cover to access the thermostat, and it’s often one that you adjust with a screwdriver. ballybally Posts: 844. Either way, you will have two separate controls: tap and radiator. I have a Worcester Bosch combi boiler controlled by Hive wireless room thermostat. How much this repair will cost will really depend on what is causing the problems with the flow rate. 3. open tap more, luke warm water comes out, combi boiler comes on, water gets hot, beceomes a trickle and combi stops heating water. Yes, a nice hot shower is supposed to be a great way to wake up, and a hot bath is a traditional way to relax after a stressful day. Combi (or combination boilers if you want to get formal) are water heaters and central heating units combined into one appliance. A boiler like a bowl of porridge should have its temperature right in the middle. Repairing or replacing a thermostat is not something you should attempt to do on your own. It’s also possible that your water is running too hot because of a mechanical or electric failure in your boiler or system. Your boiler being too hot might seem a little strange after all aren’t boilers supposed to be hot appliances? I'll … ... Saturday 13th January 2018. My hot water isn’t hot enough and I have a combi boiler. This will be higher than the other two. Fantastic. I have recently had a combi boiler put in, and whenever the hot tap is put on there is a really hot burst of water (too painful to use). If manually turning down the temperature doesn’t work, it’s time to call out a Gas Safe engineer. Combi boilers are also much smaller than a conventional boiler because of this design change and are often the boiler of choice for the more modern household. The temperature your hot water should be set to depends on the type of system that you have. If you are unsure what is the optimum temperature is for your home, then it should be around 21 degrees which is a comfortable heat. It might seem like an expensive solution, but boiler repairs are expensive unless you have boiler cover, especially if you have to keep getting the same issues patched up time and time again. Hotter water might make the room heat up faster, but the eventual temperature will be the same. Combi Boiler won't maintain hot water temp. A system or conventional heat-only boiler feeds its water in pipes around the hot water cylinder, which warms up the fresh water inside. Is your hot water cycling hot and cold? The boiler is a combi condensing boiler and the water comes in from the mains. Some people like it very hot so they can clean dishes with it; others prefer it to be a bit cooler so they lower the risk scalding and can fill a bath without needing much cold water. Have you ever read Goldilocks and The Three Bears? If you have a combi boiler, hot water isn’t heated and stored in advance in a cylinder. 4. If you have immersion heaters in your cylinder, they will have their own thermostats. Adjusting the temperature of a system or conventional boiler can be a bit more tricky, as the thermostat and adjuster are often on the boiler itself. It will also be sure to be much more energy-efficient and safe as well. A thermostat suffering from problems could cause misreading’s in the temperature it might seem like things are nice and cool only for them to be incredibly hot when you touch them. The installer set the temperature to 55 degrees. As the source of central heating and hot water, a functional boiler is essential to any British home – particularly during the colder months. Temperature drops and the cycle repeats. Setting the boiler controls on a Worcester combi boiler. Everyone one saying the same too. The immersion heater is off (never used) Combi boilers provide heating and hot water on demand and the diverter valve directs the hot water to either the radiators or the hot water outlets. They could be manual, i.e. After that, you may have a shower going hot and cold because the combi boiler can only pass on what it receives. If it’s digital, consult your boiler’s instructions to find the settings, but it should be quite straightforward. The water might not be up to temperature, and if your hand is cold, the water will feel hotter than it would if your hand’s warm. So, after the intial flow which will come from the resevoir in the boiler, you may find the water cooler than previously for a given rate of flow. Credit is subject to age and status and is available to UK residents with a bank account in the UK aged 18 and over who have not been declared bankrupt of had CCJ or an IVA within the last 6 years. If manually turning down the temperature doesn’t work, it’s time to call out a … Domestic hot water flow rate: 10.2 litres per minute at 35 degree temperature rise (provided adequate mains water pressure is available) so it will be important to know how much hot water it delivers, and compare this with the cold water flow. There will be variations between models, but most Worcester combi boiler thermostats work on a principle of selecting the hours you want the radiators to be on from a 24 hour clock. The dial on the tank is at 60 degrees, but the water coming out of the tap is much hotter. Water from boiler too hot? Either way, you are best advised to contact a professional engineer to examine your combi boiler to see if they can diagnose the problem. Everything seems OK so far, but I have a question relating to the hot water temperature. Modern combi boilers are just perfect for not taking up a lot of space in the home, whilst giving you instant access to hot water and heating day or night – at a moment’s notice. Combi boiler temperature setting advice: Problem: Temperature dials on the boiler unit are too high. Water flowing too slowly over the heat exchanger could cause it to overheat, as could a faulty thermostat. One thing that’s useful to do is to check the temperature before you make any adjustments, so you can compare it after any changes. Poking your finger into water flowing from the tap isn’t accurate. You can buy a boiler online with Boiler Central. Water flowing too slowly over the heat exchanger could cause it to overheat, as could a faulty thermostat. These control the output temperature for the radiators and the hot water temperature. Check your manual for details, but you should be able to lower the temperature at one of these controls. Yes, that is a strange way to open an article about the dangers of combi boilers being too hot but stick with me I am going somewhere with this. Do you want to learn what might be causing it and how to fix it? Get it fixed with our handy guide. I was impressed with this performance on a high temp, but wouldnt normally have it so hot. So, let’s look at some of the common temperature problems with combi boilers and find out how to deal with them. Thermostat faults (even simple ones) will still require experienced hands to fix so with this kind of problem you should always call in an engineer to assist. The settings for hot water is on the lowest on the boiler and when I run the hot water (anywhere in the house) the water becomes too hot. An engineer will have to inspect the combi boiler first to see if they can diagnose what the problem is and then you’ll get a quote for repairs. 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