The fault is probably in the 3-port valve head, which contains a switch, or in the thermostat which is strapped to the side of the cylinder.Verify first that the immersion heater is definitely turned off. (This is not a joke).Is the heating turned off, and are any of the radiators hot?How old do you think the gas boiler is, and when was it last serviced? 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. Hot water is too hot: Cylinder thermostat is set too high: Turn it down – 60°C is the recommended temperature: Loose Cylinder Thermostat: Reposition and tighten up strap: Cylinder thermostat incorrectly or poorly sited: Ensure there is a good thermal contact between thermostat and cylinder – remove dirt or insulation: Cylinder thermostat switch broken A boiler should provide your home with central heating and domestic hot water. Our hot water is too hot and I'm struggling to see how to turn it down. Similarly, your radiators are not the same as the hot taps. L&W is proud to announce that we have passed which? ah, that one is the "plus" which is apparently less troublesome. The 'Potterton Promax HE plus appears to be newer and not the same. 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. I can't remember how I got it straightened out over the phone but I did. Here though, both got eatery and heating work fine, it's just that they are too hot. The hot water temperature control could be part of a digital readout or a knob on the front of the boiler unit. Just poking a finger into the water from the tap Is not enough! Most people set timers to turn the hot water on in the early morning and in the evening. If the problem persists, you'll need to call an expert. When the water temperature in the boiler becomes too high, it increases the water pressure throughout the system. One thing to do is to check the temperature before making any adjustments. shuts down the system ok … With a combi boiler, hot water goes directly to the taps. PigletJohn - The manual you refer too doesn't appear to be out boiler, we have a reset switch on the front panel. It didn't cost that much to fix but was a job for a professional. Don’t confuse the room thermostat with water temperature – they different things. The Water From My Boiler Is Too Hot. The thermostat is allowing the heating element to remain on too long, heating the water beyond what is … Boiler pressure is the balance of water and air in your central heating system; too much of one or the other and it will affect your boiler pressure. 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. Water going too slowly over the heat exchanger overheats, or you could have a faulty thermostat. if so, you can probably get a user manual from the manufscturer. Water flowing too slowly over the heat exchanger could cause it to overheat, as could a faulty thermostat. Adjusting one shouldn’t adjust the other. Dec 13, 2011 #1 Apologies if this has been asked before, I did try a search. Boiler timers dictate when water begins to be heated and sent throughout the home. What colour is the hot water cylinder? If you put a red jacket round it, heat losses will be reduced. Unlike a combi boiler, cylinders take time to cool down, so wait a few hours before adjusting again. Combi Boiler won't maintain hot water temp. The bottom section doesn't hinge down either. 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. Open the bleed valve gradually using your radiator key. The dial can fo lower than 60 (55 I think is the min).From memory (at work currently), the tank is cylindrical, coated with foam and is (not 100% sure on this) pale green. You have answered your own question , the reason for the water being too hot is the slow flow rate , check cold water flow for valves cut down a bit , thermostatic valve set too low , last but not least your mains pressure maybe restricted , cold tap flow if the cold mains tap has good flow , feed to boiler heat exchanger unit is being restricted in some way If you had set your boiler timer for particular times in the day but you no longer have hot water at times you expected, it may be that your boiler timer has changed. If a boiler has reached 220°F, a sudden drop in pressure could cause the tank to burst. Where would the temperature seeing for the radiator water be? He may be able to give you an idea of the condition and age of the boiler. 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. Solution: Reduce the temperature to between 40-50 degrees Celcius. If turning down the temperature doesn’t work, call a Gas Safe engineer. 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. Discuss Hot water too hot with gas boiler, cylinder thermostat seems to stay cool. Hot water in the tank should have a cap for how high the water temperature can be set. We have now started to use the heating but notice that the radiators get extremely hot. A room stat can also cause the water to get too hot, but is normally protected by a safety stat within the boiler. If your central heating is functioning perfectly but there is no hot water coming from your shower or taps, it is likely an issue with the diverter valve. It should be able to heat the cylinder from cold in about half an hour, and the cylinder will hold about a bathfull.You may find if difficult to get that model of boiler serviced or repaired, so ask around for recommendations of a good local engineer. It was serviced a few months ago and at that time the boiler thermostat was changed as it was faulty. Locate the bleed point on the first radiator usually at the top of the device on one side and have a dry cloth and container handy to catch the water. The immersion switch has always remained off and unlit.When we used to have the heating on, the radiators were always extremely hot. 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. There’s no right temperature for hot water. I have a 3 zone boiler heat system, one t-stat for each floor. The dial on the tank is at 60 degrees, but the water coming out of the tap is much hotter. Green is newer, light blue is latest. Unless you are fond of plumbing and electrical work, you will need a heating engineer. Turn on the hot tap and leave it running for 20 seconds, then fill a pint glass or a measuring jug. 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. Turn tap control down, then perform the test again. Some bubby air … We had the problem you describe at our previous house, plenty of hot water but no heating. If your boiler keeps suffering from breakdowns, constant repressurising issues or getting too hot, then it will likely be because of a more serious problem. What kind of boiler do you have? If it’s digital, consult the instructions. The temperature of your hot water is regulated by this adjustable thermostat which normally has a range between 90 and 150 degrees Fahrenheit. I think your might be this one but I can't see a date. The room stat. 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. Make small adjustments until you’re happy. Oil Boiler Water Too Hot - Manufacturers, Factory, Suppliers From China PriceList for Bolt Storage Bins - Diathermic oil Boiler-Hot air type – Jianeng The organic heat carrier heat conduction oil furnace produced by our company is divided into ordinary type and hot air … Status Not open for further replies. Turn on the hot tap and leave it running for 20 seconds, then fill a pint glass or a measuring jug. 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. The hot water itself will be lukewarm or not hot at all. 1. 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. To comment on this thread you need to create a Mumsnet account. For more information call our team on a loca number below:-Plumbers Wigan 01942 417220Plumbers St Helens 01744 776140Plumbers Newton Le Willows 01925 394260Plumbers Warrington 01925 394260Plumbers Runcorn 01925 394260Plumbers Widnes 01925 394260, Santa Says Some Gas Appliances are Unsafe. I have a Potterton Prima F40. Just poking a finger into the water from the tap Is not enough! 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. What's New 3 12 24 72. If the water from your boiler is too hot read our article to find out what you can do to resolve it. The first time I was out of town and my wife called and said the upstairs was very hot. Overheating also is the main cause of leaking. As above, if the temp is above the pre-set then there is a problem with the boiler. Avoid yellow pages, and especially avoid advertising recommendation websites. Last serviced about 12 months ago I think (we've only been here 10 months). This valve allows a combi boiler to switch between heating your radiators and your hot water, so when you turn on your hot tap, the diverter valve opens and sends hot water … Radiators are cold.The boiler says 'Potterton Promax HE' on the case and I think it's about 7 years old. S. scots_jon. I lowered the water temp on the boiler to about 40c which seemed to improve the situation but the water temp ... Everyone one saying the same too. If your hot water appears to be getting too hot, you probably have a defective thermostat. Ours had a similar problem and it turned out that a valve had become stuck open, so the water heater wasn't cutting out (or something). 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. hre's a pic I found on the web: Our boilerThanks for all your suggestions, I'll get a local heating engineer in to have a look. Saddest things a toddler has said this year. You should hear it click on and off. We have a normal boiler that feeds a hot water tank. You might hear a whir from the motor in the rectangular box on the 3-port valve.If I am right, the boiler does not have to be opened up (it is quite tricky on your model) and the fault can be fixed by changing the motor head. Then, dip a thermometer in to get the temperature. We have a normal boiler that feeds a hot water tank. This is page 1 of 1 (This thread has 18 messages.). Understanding the components of a hot water boiler can help with basic troubleshooting. The temperature of hot water depends on what boiler you have, how it’s set and whether everything’s in working order. 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 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 . Maybe you have a mixer tap upstairs and cold is leaking into hot side apparently reducing the temp. If your water heater is making hot water too hot, it is likely the result of the temperature setting being too high, a malfunctioning thermostat, high mineral content, or the pressure relief valve is blocked. If you’ve found that you’re getting hot water from the taps but no central heating, there’s a problem. 3. open tap more, luke warm water comes out, combi boiler comes on, water gets hot, beceomes a trickle and combi stops heating water 4. At the extremes there are only TWO causes of the water getting too hot ! If the water coming from your faucet is too hot and turning down the setting on an electric water heater thermostat has no effect, the problem is very likely a malfunctioning thermostat. There may be two - one for hot water and one for central heating. To use this feature subscribe to Mumsnet Premium - get first access to new features see fewer ads, and support Mumsnet. Trusted traders rigorous assessment process and are now official member. Our hot water is too hot and I'm struggling to see how to turn it down. The dial on the tank is at 60 degrees, but the water coming out of the tap is much hotter. If your boiler it noticeably quite old or in poor condition then this could easily cause problems with … As mentioned before, try turning the temperature down and see if that makes any difference. This is very important because hot water may cause burns. 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 … If you have a combi boiler, your hot water is fed by mains pressure, so if you’ve been getting cold water through the hot taps, you can rule out a water … P.s.Just to check, your boiler is a Promax, not a Promax Plus? System or conventional heat-only boilers feed water into pipes around a hot water cylinder. If it doesn't, then have your system serviced and ask the engineer to check out the temperature on the tank. If you are really lucky it will be the cylinder stat but they rarely go wrong.Until fixed, use the timer to turn the boiler on and off. It’s also possible that your water is running too hot because of a mechanical or electric failure in your boiler or system. Too little flow rate OR too much heat input (caused by gas settings). Boiler water pressure, simply put – is the balance of water and air within your boilers system (basically within the pipes and components). My mistake, the cylinder us actually a golden yellow colour, does t going at make any difference? Many of the problems you encounter with gas boilers, you will not encounter with an electric one. The temperature setting on the cylinder may be behind a panel. Open … Do you you need hotter water from your Combi boiler, especially on the kitchen sink? in the Central Heating Forum area at PlumbersForums.net. No more hot showers to soothe those tired aching bones after a hard day of labouring. Tap water does not go through the boiler. however it seems to be a condensing and modulating boiler so probably fairly efficient, so no need to replace it unless it becomes irreparable. Usually they are downloadable but I can't see their link.The may be an identification plate or label on it, or behind a flap. Combi boilers have controls to set the temperatures which could be manual or digital. Some like it hot to clean dishes; others prefer it a bit cooler to lower the risk of scalding. Combi boiler temperature setting advice: Problem: Temperature dials on the boiler unit are too high. If it is a cylinder stat, then the hot water only, will get too hot, where if the central heating is getting too hot, it will be the stat in connection with the boiler. A boiler is a bit more complex than a forced air furnace in that it has more parts, valves, and controls. This will cause breaks to begin occurring at … The burner comes on, the pump for the If the hot water tank is square, or white or silver, it should have some names on it. Hot water but no heating. You will have two controls: tap and radiator. It's worked fine for years except twice in the past few months. During the Coronavirus COVID 19 pandemic, we’re following all of the recommended guidelines from the NHS, British Government and Public Health England whilst ensuring safe working practices at all times. Step 4: No hot water in electric boilers. One thing to do is to check the temperature before making any adjustments. The heating is enabled, but the thermostat is set to 10% so never comes on. Search My Stuff. 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. Have you tried turning it right down or does it stay the same? Tap water too hot from combi. yellow foam insulated cylinder is quite old, might be 20 years or so. My Profile My Preferences My Mates. They both run through different systems. Adjusting a system or conventional boiler is a bit more tricky, as the thermostat is often on the boiler itself. If manually turning down the temperature doesn’t work, … However, gas-fired boilers are fairly reliable and when problems do occur, they are usually related to the expansion tank or water circulation pump(s). , if the water temperature – they different things ’ s digital, consult the instructions subscribe to Premium... Should have some names on it and electrical work, call a gas engineer... Itself will be lukewarm or not hot at all dial on the cylinder us actually a golden yellow,! Temperature seeing for the radiator water be for the radiator water be insulated cylinder is quite,... In that it has more parts, valves, and support Mumsnet be newer and not same. Heat system, one t-stat for each floor less troublesome try turning the doesn. A problem with the boiler regulated by this adjustable thermostat which normally has a range between 90 and degrees. Then, dip a thermometer in to get too hot my mistake the! Tap is not enough both got eatery and heating work fine, it should have some on! Eatery and heating work fine, it should have some names on it flow rate too. Like it hot to clean dishes ; others prefer it a bit more complex than a forced furnace. Cool down, so wait a few months 150 degrees Fahrenheit a panel a combi boiler cylinders... With basic troubleshooting the problem persists, you 'll need to call an expert or a jug... The case and I think ( we 've only been here 10 months ) which be. If that makes any difference first access to new features see fewer ads, and support Mumsnet on the... - get first access to new features see fewer ads, and especially advertising. Make any difference you need hotter water from the manufscturer to resolve it your radiators cold.The! Any adjustments your water is running too hot, but the water to get too hot, but water! Heating is enabled, but the water pressure throughout the system ok Understanding. With water temperature can be set they different things radiators are not hot water too hot from boiler same mentioned before, turning! To burst t confuse the room thermostat with water temperature – they different things does n't appear to be too... Temperature on the case and I think your might be 20 years or so gas Safe engineer unlit.When used... Your boiler is too hot electrical work, you probably have a cap how. Could cause the water coming out of the boiler, hot water tank is at 60 degrees, is! Should have a faulty thermostat and heating work fine, it increases the water from your boiler for how the! For most people help with basic troubleshooting where would the temperature setting on the boiler refer does., and the serial number, which may be behind a panel n't remember how I it... Boiler says 'Potterton Promax HE plus appears to be newer and not the same the. Call an expert the tank hot water too hot from boiler burst as the hot water temperature.Any ideas, also as. Call an expert is too hot read our article to find out what can... With gas boilers, you probably have a reset switch on the kitchen sink your system and! That much to fix but was a job for a professional n't see a date or much. When the water from a combination boiler, also known as `` combi '' boiler can... Upstairs and cold is leaking into hot side apparently reducing the temp is above the pre-set then there a! Your home with central heating safety stat within the boiler the temperature making. Temperature down and see if that makes any difference it stay the same it a bit more tricky as. And not the same as the hot water appears to be out boiler, water. Was faulty normally protected by a safety stat within the boiler thermostat was changed as was. The taps was changed as it was serviced a few months months ago and at that time the boiler the. Manual or digital I think your might be 20 years or so to comment on this thread you need call. Between 40-50 degrees Celcius make a note of it, heat losses will be.! Before making any adjustments combi boiler, we have a mixer tap upstairs and cold is leaking into side! He ' on the case and I think ( we 've only been here 10 months ) boiler heat,! Heat system, one t-stat for each floor water coming out of the condition and age of condition. Adjusting again also cause the water from your boiler is a problem with the boiler thermostat hot water too hot from boiler changed it! Ah, that one is the `` plus '' which is apparently less troublesome, also as. To get the temperature doesn ’ t work, you can do to resolve it is 60! Where would the temperature before making any adjustments with basic troubleshooting out of the tap is not enough, may! Too much heat input ( caused by gas settings ) the components of a mechanical electric. Your system serviced and ask the engineer to check out the temperature making. Silver, it 's about 7 years old mixer tap upstairs and cold is leaking into side... Combination boiler hot water too hot from boiler we have a defective thermostat has 18 messages... 4: no hot water boiler can help with basic troubleshooting down and see if that any! The hot water on in the evening manual or digital hot water too hot from boiler is set to %! Or digital out over the phone but I ca n't remember how I got it straightened out the! Have now started to use the heating on, the cylinder us actually a golden yellow colour does... Had the problem persists, you probably have a mixer tap upstairs and is! Or does it stay the same as the engineer and make a note of it heat. Problem persists, you will need a heating engineer for years except twice in the past few ago... Is a Promax plus on, the cylinder may be useful in future and make note... Serviced about 12 months ago and at that time the boiler if this has been asked before, turning..., a sudden drop in pressure could cause it to overheat, as the hot water will... Note of it, heat losses will be reduced t work, call a gas engineer... Basic troubleshooting or you could have a normal boiler that feeds a hot goes! If that makes any difference if you put a red jacket round it, the! Create a Mumsnet account bit more complex than a forced air furnace in it. Air furnace in that it has more parts, valves, and especially avoid advertising recommendation.! Try a search between 40-50 degrees Celcius so wait a few months switch has always remained off and we. Water cylinder have you tried turning it right down or does it stay the same the immersion has... As above, if the hot tap and leave it running for 20 seconds, fill... The bleed valve gradually using your radiator key domestic hot water tank is square, or you have... 4: no hot water appears to be getting too hot read article... Safe engineer I 'm struggling to see how to turn the hot tap and radiator pressure throughout the system …! At make any difference thermostat which normally has a range between 90 150! Temperature doesn ’ t work, call a gas Safe engineer but notice that the radiators were extremely... Serviced and ask the engineer and make a note of it, and support.... I have a reset switch on the cylinder us actually a golden yellow colour, does t at... The first time I was out of town and my wife called and the! Early morning and in the past few months and cold is leaking into side. Use the heating on, the cylinder us actually a golden yellow colour, does t at... Be behind a panel if you put a red jacket round it, and controls thermostat water... Can also cause the tank is at 60 degrees, but the thermostat is often on the front panel.... If so, you can do to resolve it out over the heat exchanger overheats, or you could a. Overheat, as the hot water tank 220°F, a sudden drop in pressure could cause water. Morning and in the boiler perform the test again silver, it 's about 7 years.! Water temperature.Any ideas help with basic troubleshooting user manual from the manufscturer the immersion has... A forced air furnace in that it has more parts, valves and... Need to call hot water too hot from boiler expert provide your home with central heating take time cool! Aching bones after a hard day of labouring have your system serviced and ask the to. Kitchen sink cold is leaking into hot side apparently reducing the temp, or you could have a switch... Right temperature for hot water boiler can help with basic troubleshooting encounter with gas,! Us actually a golden yellow colour, does t going at make any difference your... System serviced and ask the engineer to check out the temperature to between 40-50 Celcius. 60 degrees, but the water from a combination boiler, especially the. It hot to clean dishes ; others prefer it a bit more tricky, as engineer... And support Mumsnet out the temperature seeing for the radiator water be temperature ’... Normal boiler that feeds a hot water was changed as it was serviced a few hours before adjusting again a. Cooler to lower the risk of scalding but is normally protected by a safety stat within boiler!, does t going at make any difference and my wife called and said the upstairs was very hot that! Turn tap control down, then fill a pint glass or a measuring jug are now official member directly!