As well as being better insulated, the later ones heat up faster because they have bigger coils.For your radiators, there should be a wall thermostat that turns off the flow to the radiators when the rooms are warm, and the boiler should stop firing if both the cylinder stat and the room stat are satisfied, via the switch in the 3-port pump. I had a look at a pic of your boiler, and it does not appear to have a boiler temperature knob, it might be preset temperature, and there is a chance that the setting is wrong or failed. To do any diagnosis from here we will need the cold water temp, the (boiling/scalding) hot water temp and flow rate from the hot tap in litres per minute. Unlike a combi boiler, cylinders take time to cool down, so wait a few hours before adjusting again. Water flowing too slowly over the heat exchanger could cause it to overheat, as could a faulty thermostat. Some bubby air … My mistake, the cylinder us actually a golden yellow colour, does t going at make any difference? https://www.mumsnet.com/Talk/mumsnet_surveys/a4112595-MNer-with-at-least-one-car-in-your-household-Take-this-survey-100-voucher-to-be-won, Find out what Mumsnet users thought of Echo by Lloyd’s Pharmacy, Share your imaginative play tips with The LEGO Group: £200 voucher to be won, Talk widget showing discussions of the day & trending threads, Subscribe to Mumsnet emails direct to your inbox. yellow foam insulated cylinder is quite old, might be 20 years or so. If your hot water is boiling and running out of the overflow pipe or your central heating radiators are too hot here are some simple checks to make . Now, combi boilers are considered high-efficiency water heater and central heating units, which means that they can both heat your home and provide hot water, without the need for a separate water tank. Boilers - Home Heating Steam and Hot Water Systems - Oil boiler water temp too hot - I have a Newmac oil fired boiler that I just fired up for this season. The temperature of your hot water is regulated by this adjustable thermostat which normally has a range between 90 and 150 degrees Fahrenheit. Make small adjustments until you’re happy. As mentioned before, try turning the temperature down and see if that makes any difference. What's New 3 12 24 72. Just poking a finger into the water from the tap Is not enough! However, combi boilers are prone to the common problem of causing the hot water to go cold or lukewarm and then back to hot again. You will have two controls: tap and radiator. This will cause breaks to begin occurring at … The Water From My Boiler Is Too Hot. I managed to fix this problem for Father Clarke whilst looking at his boiler and figured this solution might help others who are experiencing a similar boiler fault. There’s no right temperature for hot water. Most people set timers to turn the hot water on in the early morning and in the evening. Hot water but no heating. The immersion heater is off (never used)Our boiler is a Potterton Promax HE and the only controls on the outside is one solitary reset button. The hot water temperature control could be part of a digital readout or a knob on the front of the boiler unit. The immersion switch has always remained off and unlit.When we used to have the heating on, the radiators were always extremely hot. Discuss Hot water too hot with gas boiler, cylinder thermostat seems to stay cool. Search My Stuff. If you’re suffering from low boiler pressure where the needle dips below the optimal 1.5bar level, we have covered that in our low boiler pressure blog. Use a thermometer to see what temp the hot water gets to if you leave the boiler on all day (though I would not recommend that as normal, since it may get scalding).I am not familiar with your boiler, but it seems to have a difficult reputation and may be older than you think. If your boiler it noticeably quite old or in poor condition then this could easily cause problems with … When you have no central heating, first make sure your thermostat is working and then check to see if the boiler pressure is too low. Tap water does not go through the boiler. When the water temperature in the boiler becomes too high, it increases the water pressure throughout the system. If it’s digital, consult the instructions. To comment on this thread you need to create a Mumsnet account. You can check the flow rate by measuring the time for one litre of water and calculating the litres per minute, should be around 9 li/min. Turn tap control down, then perform the test again. Close to the boiler, or close to the cylinder, there will probably be a pump (probably dark red) and a 3-port valve (brass, with three large pipes going into it in a T shape, and with a rectangular box, probably metallic grey but might be plastic. The temperature thermistor could be faulty,a faulty modulating coil on the gas valve could also cause the water to over heat.The flow rate on the boiler might not be adequate and may need increased,11 litres per minute will be adequate,you can check this with a stopwatch and a measuring jug.If you have a hand held thermometer,fill a cup with cold water then measure the temperature.Run the hot … It’s also possible that your water is too hot because of a fault in your boiler. Unless you are fond of plumbing and electrical work, you will need a heating engineer. Boiler water pressure, simply put – is the balance of water and air within your boilers system (basically within the pipes and components). 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