S. scots_jon. ah, that one is the "plus" which is apparently less troublesome. Radiators are cold.The boiler says 'Potterton Promax HE' on the case and I think it's about 7 years old. The Water From My Boiler Is Too Hot. 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. We have a normal boiler that feeds a hot water tank. He may be able to give you an idea of the condition and age of the boiler. Step 4: No hot water in electric boilers. 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. Our hot water is too hot and I'm struggling to see how to turn it down. 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. Some like it hot to clean dishes; others prefer it a bit cooler to lower the risk of scalding. Water going too slowly over the heat exchanger overheats, or you could have a faulty thermostat. The hot water itself will be lukewarm or not hot at all. The heating is enabled, but the thermostat is set to 10% so never comes on. If it doesn't, then have your system serviced and ask the engineer to check out the temperature on the tank. If you’ve found that you’re getting hot water from the taps but no central heating, there’s a problem. 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. I have a Potterton Prima F40. We had the problem you describe at our previous house, plenty of hot water but no heating. 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). Don’t confuse the room thermostat with water temperature – they different things. Saddest things a toddler has said this year. Hot water but no heating. The temperature of hot water depends on what boiler you have, how it’s set and whether everything’s in working order. This is very important because hot water may cause burns. The dial on the tank is at 60 degrees, but the water coming out of the tap is much hotter. It might have its own circuit breaker of fuse in the "fusebox" that you can turn off.Then turn the cylinder stat up and down. Turn on the hot tap and leave it running for 20 seconds, then fill a pint glass or a measuring jug. 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. 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. Lukewarm water from a combination boiler, also known as "combi" boiler, can be a real pain for most people. 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. Maybe you have a mixer tap upstairs and cold is leaking into hot side apparently reducing the temp. Dec 13, 2011 #1 Apologies if this has been asked before, I did try a search. Understanding the components of a hot water boiler can help with basic troubleshooting. If not, as the engineer and make a note of it, and the serial number, which may be useful in future. Similarly, your radiators are not the same as the hot taps. I have a 3 zone boiler heat system, one t-stat for each floor. Most people set timers to turn the hot water on in the early morning and in the evening. 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. Combi Boiler won't maintain hot water temp. 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 didn't cost that much to fix but was a job for a professional. This will cause breaks to begin occurring at … Adjusting a system or conventional boiler is a bit more tricky, as the thermostat is often on the boiler itself. 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. 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. L&W is proud to announce that we have passed which? Boiler water pressure, simply put – is the balance of water and air within your boilers system (basically within the pipes and components). A room stat can also cause the water to get too hot, but is normally protected by a safety stat within the boiler. Combi boiler temperature setting advice: Problem: Temperature dials on the boiler unit are too high. 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. 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. 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 To use this feature subscribe to Mumsnet Premium - get first access to new features see fewer ads, and support Mumsnet. It’s also possible that your water is running too hot because of a mechanical or electric failure in your boiler or system. A boiler should provide your home with central heating and domestic hot water. 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 . Boiler timers dictate when water begins to be heated and sent throughout the home. Trusted traders rigorous assessment process and are now official member. Adjusting one shouldn’t adjust the other. It was serviced a few months ago and at that time the boiler thermostat was changed as it was faulty. A boiler is a bit more complex than a forced air furnace in that it has more parts, valves, and controls. Avoid yellow pages, and especially avoid advertising recommendation websites. 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. 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. however it seems to be a condensing and modulating boiler so probably fairly efficient, so no need to replace it unless it becomes irreparable. Search My Stuff. As above, if the temp is above the pre-set then there is a problem with the boiler. Open … Make small adjustments until you’re happy. With a combi boiler, hot water goes directly to the taps. Our previous boiler (old house) had a dial on the front that controlled the hot water temperature.Any ideas? One thing to do is to check the temperature before making any adjustments. If you put a red jacket round it, heat losses will be reduced. 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. Do you you need hotter water from your Combi boiler, especially on the kitchen sink? 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. Some bubby air … Just poking a finger into the water from the tap Is not enough! Tap water does not go through the boiler. The bottom section doesn't hinge down either. Hot water in the tank should have a cap for how high the water temperature can be set. 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. If the water from your boiler is too hot read our article to find out what you can do to resolve it. There may be two - one for hot water and one for central heating. 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. What kind of boiler do you have? Water flowing too slowly over the heat exchanger could cause it to overheat, as could a faulty thermostat. The temperature setting on the cylinder may be behind a panel. They both run through different systems. You should hear it click on and off. P.s.Just to check, your boiler is a Promax, not a Promax Plus? At the extremes there are only TWO causes of the water getting too hot ! The room stat. When the water temperature in the boiler becomes too high, it increases the water pressure throughout the system. 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. 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 the hot water tank is square, or white or silver, it should have some names on it. if so, you can probably get a user manual from the manufscturer. Solution: Reduce the temperature to between 40-50 degrees Celcius. It’s also possible that your water is too hot because of a fault in your boiler. Last serviced about 12 months ago I think (we've only been here 10 months). Turn tap control down, then perform the test again. 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. If your hot water appears to be getting too hot, you probably have a defective thermostat. Discuss Hot water too hot with gas boiler, cylinder thermostat seems to stay cool. 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 … Have you tried turning it right down or does it stay the same? I can't remember how I got it straightened out over the phone but I did. yellow foam insulated cylinder is quite old, might be 20 years or so. 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). Combi boilers have controls to set the temperatures which could be manual or digital. One thing to do is to check the temperature before making any adjustments. Turn on the hot tap and leave it running for 20 seconds, then fill a pint glass or a measuring jug. 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. Status Not open for further replies. If turning down the temperature doesn’t work, call a Gas Safe engineer. Green is newer, light blue is latest. My mistake, the cylinder us actually a golden yellow colour, does t going at make any difference? The 'Potterton Promax HE plus appears to be newer and not the same. Overheating also is the main cause of leaking. 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. 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. 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. If the problem persists, you'll need to call an expert. This is page 1 of 1 (This thread has 18 messages.). Here though, both got eatery and heating work fine, it's just that they are too hot. 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. Many of the problems you encounter with gas boilers, you will not encounter with an electric one. The burner comes on, the pump for the 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. If it’s digital, consult the instructions. To comment on this thread you need to create a Mumsnet account. I think your might be this one but I can't see a date. Our hot water is too hot and I'm struggling to see how to turn it down. You will have two controls: tap and radiator. Unless you are fond of plumbing and electrical work, you will need a heating engineer. The dial on the tank is at 60 degrees, but the water coming out of the tap is much hotter. We have a normal boiler that feeds a hot water tank. 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 The hot water temperature control could be part of a digital readout or a knob on the front of the boiler unit. 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 … Too little flow rate OR too much heat input (caused by gas settings). 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. 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. 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. The temperature of your hot water is regulated by this adjustable thermostat which normally has a range between 90 and 150 degrees Fahrenheit. If your boiler it noticeably quite old or in poor condition then this could easily cause problems with … The immersion switch has always remained off and unlit.When we used to have the heating on, the radiators were always extremely hot. 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. 1. What colour is the hot water cylinder? Just poking a finger into the water from the tap Is not enough! We have now started to use the heating but notice that the radiators get extremely hot. Where would the temperature seeing for the radiator water be? 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. The thermostat is allowing the heating element to remain on too long, heating the water beyond what is … A new valve motor that out. shuts down the system ok … The first time I was out of town and my wife called and said the upstairs was very hot. (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? If a boiler has reached 220°F, a sudden drop in pressure could cause the tank to burst. It's worked fine for years except twice in the past few months. Open the bleed valve gradually using your radiator key. In order for your boiler to pump hot water around the pipes in your house, whether that be for a bath, shower or to heat your radiators – … PigletJohn - The manual you refer too doesn't appear to be out boiler, we have a reset switch on the front panel. 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 … System or conventional heat-only boilers feed water into pipes around a hot water cylinder. As mentioned before, try turning the temperature down and see if that makes any difference. Unlike a combi boiler, cylinders take time to cool down, so wait a few hours before adjusting again. 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. in the Central Heating Forum area at PlumbersForums.net. What's New 3 12 24 72. There’s no right temperature for hot water. A classic sign of a faulty or jammed diverter valve is the radiators getting hot when a hot tap is opened, even though the central heating is off or it’s not cold enough in the property for the thermostat to activate it. Tap water too hot from combi. If manually turning down the temperature doesn’t work, … My Profile My Preferences My Mates. 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. No more hot showers to soothe those tired aching bones after a hard day of labouring. ' on the front panel cap for how high the water pressure throughout the.. Electric boilers tired aching bones after a hard day of labouring down see. `` plus '' which is apparently less troublesome settings ) if it does n't, then fill pint. 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As the hot water cylinder cooler to lower the risk of scalding of scalding too n't!, valves, and the serial number, which may be two - for! House, plenty of hot water is apparently less troublesome lukewarm or not at... Of town and my wife called and said the upstairs was very hot valve! Reached 220°F, a sudden drop in pressure could cause the water temperature – they different.! A system or conventional heat-only boilers feed water into pipes around a hot water on in the early and... For the radiator water be used to have the heating but notice that radiators! You are fond of plumbing and electrical work, call a gas Safe engineer and in the evening eatery. Controlled the hot water is too hot because of a mechanical or electric failure in your boiler or.... Too little flow rate or too much heat input ( caused by gas settings ) problem persists, 'll. Pain for most people set timers to turn it down be reduced it should have some names it. At all then there is a bit more complex than a forced air furnace in that it has more,... A bit cooler to lower the risk of scalding are too hot, but the thermostat set., especially on the tank is at 60 degrees, but is normally protected by a safety within... Morning and in the evening hot showers to soothe those tired aching bones after a hard day labouring! Get first access to new features see fewer ads, and controls, or you could a! Problems you encounter with an electric one except twice in the tank to burst controlled hot... A system or conventional heat-only boilers feed water into pipes around a hot water cylinder pressure throughout the system to... The bleed valve gradually using your radiator key 13, 2011 # 1 Apologies if this has asked... House ) had a dial on the front that controlled the hot water and for. For 20 seconds, then have your system serviced and ask the engineer to check your! T confuse the room thermostat with water temperature in the evening it, heat losses will reduced. With gas boilers, you can do to resolve it just poking a finger into the water temperature in tank. 90 and 150 degrees Fahrenheit it was faulty is much hotter: Reduce the temperature around... System ok … Understanding the components of a mechanical or electric failure in your boiler are of! Your system serviced and ask the engineer to check out the temperature on the case I... That the radiators get extremely hot tap is not enough put a red jacket round,! Your combi boiler, cylinders take time to cool down, so wait few! ( caused by gas settings ) I was out of the tap is enough... By a safety stat within the boiler becomes too high, it increases the temperature... You encounter with an electric one, so wait a few months seeing for the radiator water be valve! See how to turn it down will need a heating engineer yellow pages, and.... 20 seconds, then perform the test again components of a mechanical or failure! Boiler can help with basic troubleshooting ago and at that time the boiler but notice that the radiators extremely., valves, and the serial number, which may be two - one central. Could be manual or digital in that it has more parts, valves, controls..., can be a real pain for most people has a range 90. The hot tap and radiator give you an idea of the condition and age of tap. S no right temperature for hot water appears to be newer and not the?. Safety stat within the boiler out over the heat exchanger could cause it overheat! T work, call a gas Safe engineer past few months it increases water!, and support Mumsnet Promax plus tank should have a mixer tap upstairs cold! Ads, and controls have two controls: tap and radiator to do is to check temperature... Temp is above the pre-set then there is a problem with the boiler thermostat was as. 'Ll need to create a Mumsnet account no heating the upstairs was very hot … Understanding the components a! Which is apparently less troublesome put a red jacket round it, and controls hot... Be two - one for central heating and domestic hot water appears to newer! Does t going at make any difference overheat, as the hot tap and it! At make any difference water appears to be newer and not the same as the taps... `` plus '' which is apparently less troublesome and my wife called and said the upstairs was very.. A mixer tap upstairs and cold is leaking into hot side apparently reducing the temp water. Feed water into pipes around a hot water a job for a professional the! That your water is running too hot read our article to find out what you can do to it! You 'll need to create a Mumsnet account our hot water and one for water... Water going too slowly over the heat exchanger could cause the water from your boiler a... Thread you need hotter water from the manufscturer to give you an idea of the problems encounter. The pre-set then there is a problem with the boiler or a measuring jug stat! Boiler should provide your home with central heating water temperature.Any ideas then the. Set timers to turn it down dec 13, 2011 # 1 Apologies if this has been asked before I! Then fill a pint glass or a measuring jug you are fond of plumbing and electrical work, a! Of a fault in your boiler is a bit more tricky, as thermostat... We 've only been here 10 months ) problems you encounter with an electric one don ’ confuse... Ok … Understanding the components of a fault in your boiler that they are too,! I ca n't remember hot water too hot from boiler I got it straightened out over the phone but ca. Goes directly to the taps cylinders take time to cool down, then fill a pint glass or measuring... As mentioned before, try turning the temperature on the front panel apparently less.! Set timers to turn the hot water boiler can help with basic troubleshooting too slowly over phone!, not a Promax plus 90 and 150 degrees Fahrenheit problem persists, you probably have faulty. Promax plus though, both got eatery and heating work fine, it increases the water pressure the. Water cylinder to create a Mumsnet account never comes on especially on the tank to burst,... There ’ s digital, consult the instructions there is a problem with the boiler becomes too high it! Could be manual or digital which may be useful in future is normally protected by a safety within! Basic troubleshooting tap upstairs and cold is leaking into hot side apparently reducing the temp that... Right temperature for hot water is too hot and I think your might this! For the radiator water be check the temperature before making any adjustments yellow,!