Discuss Combi Boiler water to hot. in the DIY Electrical Advice area at ElectriciansForums.net
I agree with telectrix that it sounds like you have a faulty thermostatfaulty stat on boiler?
Hi thanks for your reply, no its not doing that, It starts off from 50c then slowly goes up when the shower is used till it reaches approx. 70c+Most combi boilers dont have thermostats to control the heat of the water, its controlled through the flow of water through the heat exchanger.
Does it go up in temp for a bit then drop down and keep cycling like that? If so it is a blocked plate heat exchanger.
On your heat exchanger do y’all have temperature transmitters on the inlet of the heat exchanger and on the outlet ?Most combi boilers dont have thermostats to control the heat of the water, its controlled through the flow of water through the heat exchanger.
Does it go up in temp for a bit then drop down and keep cycling like that? If so it is a blocked plate heat exchanger.
Do you mean the main heat exchanger or the hot water one? Theres definitely sensors but they don't necessarily control the temperature, just for overheat.On your heat exchanger do y’all have temperature transmitters on the inlet of the heat exchanger and on the outlet ?
The heat exchanger and the transmitters which monitors the incoming temperature to the out going temperature which would tell me if I had a rise in temperatureDo you mean the main heat exchanger or the hot water one? Theres definitely sensors but they don't necessarily control the temperature, just for overheat.
Hi thanks , I did renew a thirstier or DHW Temperature sensor fitted to the heat exchanger, I had to do this as we error code come up & had no hot water, but this seems to be ok now, that was about 6 moths ago.On your heat exchanger do y’all have temperature transmitters on the inlet of the heat exchanger and on the outlet ?
On the main exchanger there are definitely in and out sensors. They control the main circulation. On the plate there are similar sensors. they will give a raise in temperature figure which you can check between the mains water and hot water to check it is working correctly.The heat exchanger and the transmitters which monitors the incoming temperature to the out going temperature which would tell me if I had a rise in temperature
Yea, you would be better of on the plumbing forum anHi thanks , I did renew a thirstier or DHW Temperature sensor fitted to the heat exchanger, I had to do this as we error code come up & had no hot water, but this seems to be ok now, that was about 6 moths ago.
Some one said it may be the Hall effect sensor. Not to sure where that is?
I may have to get a local engineer out to check it all out.
But they quoted ÂŁ90 hour, wish I got that when I was working.
Any way thanks for looking & your advice.
Yea, you would be better off on the plumbing forum.Hi thanks , I did renew a thirstier or DHW Temperature sensor fitted to the heat exchanger, I had to do this as we error code come up & had no hot water, but this seems to be ok now, that was about 6 moths ago.
Some one said it may be the Hall effect sensor. Not to sure where that is?
I may have to get a local engineer out to check it all out.
But they quoted ÂŁ90 hour, wish I got that when I was working.
Any way thanks for looking & your advice.
That’s good money I’m like you I wished I got that kind of money good luckHi thanks , I did renew a thirstier or DHW Temperature sensor fitted to the heat exchanger, I had to do this as we error code come up & had no hot water, but this seems to be ok now, that was about 6 moths ago.
Some one said it may be the Hall effect sensor. Not to sure where that is?
I may have to get a local engineer out to check it all out.
But they quoted ÂŁ90 hour, wish I got that when I was working.
Any way thanks for looking & your advice.
Try living in London ?That’s good money I’m like you I wished I got that kind of money good luck
No way my friend way to crowed for and no parking is what I hearTry living in London ?
Thank you for your reply, I do agree combo boilers are not good for showers. Before we had electric shower, I really do wish I put electric back in, It might come to that later.It's "normal".
A combi has a minmum power input, which for a water efficient shower may be too high for the flow rate. So you start the shower, and at first it calls for a lot of hot water. As the hot water gets to the shower, the thermostat reduces the hot water flow rate - and the boiler will reduce the gas flow accordingly.
But it sounds like the shower is reducing the hot water flow rate beyond the point where the boiler can reduce the gas flow rate any further. At this point, the water temperature will increase.
What happens next depends on a number of factors. The shower temperature may creep up a bit and the system settle in a state where it's using as much heat as the boiler can range down to. The boiler outlet temperature may creep up to the point where the boiler turns off - at which point the hot water temperature will drop failure quickly before the boiler fires again.
Or, as we think happened to mother the other day, the shower valve may throttle down the hot water to the point where the boiler turns off. It will then stay off until cooler water reaches the shower valve and the stat starts calling for more hot water. The boiler will fire up again, but by now the boiler and pipe to the shower will have cold water in them and the shower will go cold for a while while the boiler gets warmed up and the hot water comes through the pipe.
Just one of "quite a few" reasons why I "strongly dislike" combi boilers.
Do y’all not have plain old hot water heaters with thermostats. Boilers sounds dangerousThank you for your reply, I do agree combo boilers are not good for showers. Before we had electric shower, I really do wish I put electric back in, It might come to that later.
again thanks
Hang on... hang on... there's only 1 thing that Combi Boilers are any good at... and that's a decent shower !! You can shower as long as you want without any risk of running out of hot water... great for showering with a friend !Thank you for your reply, I do agree combo boilers are not good for showers. Before we had electric shower, I really do wish I put electric back in, It might come to that later.
again thanks
We have all sorts of methods to heat water here... the modern trend is to move away from a stored cold water supply, so usually we run off the water main. As for heating the water... the price of natural gas here (most households have access to it) is about ⅓ that of electricity so it's the popular choice... which usually means a combination gas boiler.Do y’all not have plain old hot water heaters with thermostats. Boilers sounds dangerous
I only said that showering was the best thing that a Combi did ! Personally, I hate the bloody things... and yes, you're right, easy to install and take up less space. Like you, if I had the space and it was my house... I'd go down the thermal store route, with solar and wood burning stove heat inputs... But we're now in the realms of a very very small number of houses.I think the comment about "boilers" was a tongue in cheek way of pointing out that the one think we don't want them tobdo is boil.
No, combis are not great for showers. Before combis, thermostatic shower valves were something of a luxury - with a combi they're essential. The only thing in favour of combis is that plumbers don't have to think and developers can shave a square yard off the size of the shoeboxes.
For mains pressure hot water with endless supply and reliability - get a thermal store with passive DHW coil.
Do y’all not have plain old hot water heaters with thermostats. Boilers sounds dangerous
Reply to Combi Boiler water to hot. in the DIY Electrical Advice area at ElectriciansForums.net
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