Unfortunately, this deal is no longer available
Vaillant ecoTEC Plus 825 (ErP) Combi Boiler, Horizontal Flue & Nest Stat £1429.07 @ MrCentralHeating
-27° Expired

Vaillant ecoTEC Plus 825 (ErP) Combi Boiler, Horizontal Flue & Nest Stat £1429.07 @ MrCentralHeating

56
Posted 27th Dec 2019

This deal is expired. Here are some options that might interest you:

The Vaillant ecoTEC Plus 825 is a high efficiency combination boiler ideally suited to 1-3 bedroom small apartments or houses with 1 bathroom. Stylish in appearance and quiet in operation, it offers excellent hot water performance with Vaillants AquaComfort system providing instantaneous hot water to your taps at a constant temperature.


  • Innovative new electronic gas and air modulation system for a cleaner, lower emission combustion
  • New higher efficiency pump for reduced energy consumption and lower standby losses
  • Flame lift detection system for more efficient and quieter combustion
  • Stylish new case and control panel design for enhanced appearance
  • Standard 5 year warranty extended to 7 years when installed by a Vaillant Advance installer
  • Kit comes complete with a horizontal flue and Nest stat

The 3rd­generation Nest Learning Thermostat in stainless steel is slimmer, sleeker and even more beautiful. With a bigger, sharper display and Farsight, you can see the time or the temperature you’ve set from across the room. And now it even controls your hot water tank.


The Nest Thermostat learns the temperature you like, then programs itself. It knows how long it takes to heat your home so that you’re comfortable when you get there. When you leave, it turns itself down so that you save energy. And you can check your Energy History with the Nest App to see how much you’ve saved.
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Top comments
Jamieteatotal27/12/2019 19:18

Great boiler but very expensive on parts. Heat added


I wouldn’t say any 25kw combi boiler is great.
Edited by: "jay1" 27th Dec 2019
Jamieteatotal27/12/2019 19:46

Would really depend on what you are heating and what hot water demand …Would really depend on what you are heating and what hot water demand there is. Perfect for a small house or flat with a single bathroom.


Why would someone in a small house or flat want a pathetic flow rate on the shower or bath compared to someone in an average sized house? It makes no sense but you’re just regurgitating the silly statements that you’ve read online. People need to stop guessing what boiler they need and get a proper quote from a heating engineer who can size the boiler correctly by checking the pressures, flow rates and heat loss.
jay127/12/2019 19:20

I wouldn’t say any 25kw boiler is great.


Surely that depends on the number of rads you have, as well as how many rooms and so on?
Jamieteatotal27/12/2019 22:57

WTF. Look bud Iam going click ignore your comments now, got nothing to do …WTF. Look bud Iam going click ignore your comments now, got nothing to do with me your the child in this situation. We’ve taken over someone’s post. Like I said have a great night


Bye Felicia
56 Comments
Great boiler but very expensive on parts. Heat added
Jamieteatotal27/12/2019 19:18

Great boiler but very expensive on parts. Heat added


I wouldn’t say any 25kw combi boiler is great.
Edited by: "jay1" 27th Dec 2019
Buy ideal or baxi 7 and 10 year warranty respectively
Edited by: "bagga212" 27th Dec 2019
I think the Nest device is really cool. I bought one from cex. However whilst researching how to install it I discovered that if you can get the Vaillant smart thermostat instead of the Nest one it would be better. Should just plug in so not wiring as such. The Vaillant device will modulate the boilers output, where as the Nest is a simple on / off of the boiler running at full blast.
Edited by: "androidavis" 27th Dec 2019
Yeah 25kw and 10l/min hot water isn't great. Only suitable for very small homes / flats with one bathroom.
jay127/12/2019 19:20

I wouldn’t say any 25kw boiler is great.


Surely that depends on the number of rads you have, as well as how many rooms and so on?
jay127/12/2019 19:20

I wouldn’t say any 25kw boiler is great.


Surely it depends how much power you need?
Got the 837 ecotec great boilers.
solid27/12/2019 19:23

Surely that depends on the number of rads you have, as well as how many …Surely that depends on the number of rads you have, as well as how many rooms and so on?


Nothing to do with rads. A combi is sized for hot water output. 25kw does about 10 litres per minute which is pathetic.
bagga21227/12/2019 19:21

By ideal or baxi 7 and 10 year warranty respectively


Ideal are a good make. A lot of people buy Worcester or Vaillant but Ideal are great too and a UK company.
Edited by: "mccririck" 27th Dec 2019
I have an Atag boiler, great flow rate and wasn't much difference in price to the vaillant 837.
Its one of the most efficient boilers out there I think and 10 Yr warranty now I believe
solid27/12/2019 19:23

Surely that depends on the number of rads you have, as well as how many …Surely that depends on the number of rads you have, as well as how many rooms and so on?


Depends on the thermal efficiency of your home.
mccririck27/12/2019 19:24

Ideal are a good make. A lot of people buy Worcester or Vaillant but Ideal …Ideal are a good make. A lot of people buy Worcester or Vaillant but Ideal are great too and a UK company.


Also research In opentherm compatible boilers & controls....

Controlling the flow temp of your boiler.


Worcester are like a go to brand because of possible kick backs and incentives to Installers.

Dont get me wrong they are all at it. Ideal on average give 50 a pound a boiler and accelerators on 4 or more boilers
Edited by: "bagga212" 27th Dec 2019
jay127/12/2019 19:20

I wouldn’t say any 25kw boiler is great.


Would really depend on what you are heating and what hot water demand there is. Perfect for a small house or flat with a single bathroom.
androidavis27/12/2019 19:22

I think the Nest device is really cool. I bought one from cex. However …I think the Nest device is really cool. I bought one from cex. However whilst researching how to install it I discovered that if you can get the Vaillant smart thermostat instead of the Nest one it would be better. Should just plug in so not wiring as such. The Vaillant device will modulate the boilers output, where as the Nest is a simple on / off of the boiler running at full blast.


Nest does this to but uses an open standard called opentherm. Shame on valiant for creating proprietary standards
Jamieteatotal27/12/2019 19:46

Would really depend on what you are heating and what hot water demand …Would really depend on what you are heating and what hot water demand there is. Perfect for a small house or flat with a single bathroom.


Why would someone in a small house or flat want a pathetic flow rate on the shower or bath compared to someone in an average sized house? It makes no sense but you’re just regurgitating the silly statements that you’ve read online. People need to stop guessing what boiler they need and get a proper quote from a heating engineer who can size the boiler correctly by checking the pressures, flow rates and heat loss.
bagga21227/12/2019 19:54

Nest does this to but uses an open standard called opentherm. Shame on …Nest does this to but uses an open standard called opentherm. Shame on valiant for creating proprietary standards


It is a shame, plus out of the two I think the nest was a bit cheaper. However for this deal the Vaillant smart thermostat is superior option.
Edited by: "androidavis" 27th Dec 2019
androidavis27/12/2019 19:57

It is a shame, plus out of the two I think the nest was a bit cheaper. …It is a shame, plus out of the two I think the nest was a bit cheaper. However for this deal the Vaillant smart thermostat is superior option.


I hear there is a unofficial opentherm bridge harness
jay127/12/2019 19:55

Why would someone in a small house or flat want a pathetic flow rate on …Why would someone in a small house or flat want a pathetic flow rate on the shower or bath compared to someone in an average sized house? It makes no sense but you’re just regurgitating the silly statements that you’ve read online. People need to stop guessing what boiler they need and get a proper quote from a heating engineer who can size the boiler correctly by checking the pressures, flow rates and heat loss.



jay127/12/2019 19:55

Why would someone in a small house or flat want a pathetic flow rate on …Why would someone in a small house or flat want a pathetic flow rate on the shower or bath compared to someone in an average sized house? It makes no sense but you’re just regurgitating the silly statements that you’ve read online. People need to stop guessing what boiler they need and get a proper quote from a heating engineer who can size the boiler correctly by checking the pressures, flow rates and heat loss.


Cheers bud, Iam a heating engineer. 10liters a minute of hot water to a shower is to bad.
A modern bath mixer tap is on average 12 l/m
Hot and/or cold
monobloc basin mixer roughly 4 to 5 l/m
kitchen tap 12 l/m through the spout

A high pressure shower would Normal need to have a larger mains water supply coming in to the property to give good flow rates in excess of 15 to 20 litre per minute.
Not every one has a good flow rate and or pressure entering their properties.

To say “I wouldn’t say any 25kw boiler is great.“
is a strange statement to make when there are situations where the boiler would be adequate.
Also a 25kw system boiler is more than adequate for most large new builds when installed with the right unvented cylinder.
Horses for course
Remember the more litres per minute the more down the drain if all you have is 1 shower. Reminder for all that are on a water meter
Edited by: "bagga212" 27th Dec 2019
Jamieteatotal27/12/2019 20:27

Cheers bud, Iam a heating engineer. 10liters a minute of hot water to a …Cheers bud, Iam a heating engineer. 10liters a minute of hot water to a shower is to bad.A modern bath mixer tap is on average 12 l/mHot and/or coldmonobloc basin mixer roughly 4 to 5 l/m kitchen tap 12 l/m through the spoutA high pressure shower would Normal need to have a larger mains water supply coming in to the property to give good flow rates in excess of 15 to 20 litre per minute.Not every one has a good flow rate and or pressure entering their properties.To say “I wouldn’t say any 25kw boiler is great.“is a strange statement to make when there are situations where the boiler would be adequate.Also a 25kw system boiler is more than adequate for most large new builds when installed with the right unvented cylinder. Horses for course


I'm a heating engineer too and I don't see incoming cold mains less than 12l/min, therefore I would never fit a 25kw combi boiler. If you would, I feel sorry for your customers.

Of course a 25kw system boiler would be sufficient, it's doing a completely different job to a combi!! Are you really a heating engineer?
Edited by: "jay1" 27th Dec 2019
jay127/12/2019 20:35

I'm a heating engineer too and I don't see incoming cold mains less that …I'm a heating engineer too and I don't see incoming cold mains less that 12l/min, therefore I would never fit a 25kw combi boiler. If you would, I feel sorry for your customers.Of course a 25kw system boiler would be sufficient, it's doing a completely different job to a combi!! Are you really a heating engineer


Sorry you said “I wouldn’t say any 25kw boiler is great” Not any 25kw combi boiler .
its 10 litres of hot water flow rate so a minimum of 12 litres would leave you with only 2 litres of cold if you where to run the hot flat out.

Alex_fynn posted a fairly good deal for people who are in the market for a 25kw boiler, especially if you don’t have terms or in the trade.
Also a system boiler heats the rad/ufh in the same way as a combi boiler so not really completely different.
bagga21227/12/2019 19:59

I hear there is a unofficial opentherm bridge harness



There is but it's officially only available in Holland I believe and if you fit one to your boiler in any other country it invalidates your warranty if the boiler is covered by one.
Jamieteatotal27/12/2019 20:44

Sorry you said “I wouldn’t say any 25kw boiler is great” Not any 25kw combi …Sorry you said “I wouldn’t say any 25kw boiler is great” Not any 25kw combi boiler .its 10 litres of hot water flow rate so a minimum of 12 litres would leave you with only 2 litres of cold if you where to run the hot flat out.Alex_fynn posted a fairly good deal for people who are in the market for a 25kw boiler, especially if you don’t have terms or in the trade.Also a system boiler heats the rad/ufh in the same way as a combi boiler so not really completely different.


Most houses are around 14l/min with new builds around 20l/min!
General public don't know what boiler they need, and I see plenty of people buying their own boiler and then getting a heating engineer to install it, to then ask why their hot water runs so slow! And being stuck with it for the next 10 years. So no, it isn't a good deal at all really.
A system boiler doesn't have to heat the cold main as it runs through the boiler to an outlet does it.....
You should be an electrician, you're not bright enough to be a heating engineer
secsteel27/12/2019 20:46

There is but it's officially only available in Holland I believe and if …There is but it's officially only available in Holland I believe and if you fit one to your boiler in any other country it invalidates your warranty if the boiler is covered by one.


F them
jay127/12/2019 20:55

Most houses are around 14l/min with new builds around 20l/min!General …Most houses are around 14l/min with new builds around 20l/min!General public don't know what boiler they need, and I see plenty of people buying their own boiler and then getting a heating engineer to install it, to then ask why their hot water runs so slow! And being stuck with it for the next 10 years. So no, it isn't a good deal at all really.A system boiler doesn't have to heat the cold main as it runs through the boiler to an outlet does it.....You should be an electrician, you're not bright enough to be a heating engineer





Not completely different heat the heating water the same way. “Of course a 25kw system boiler would be sufficient, it's doing a completely different job to a combI” .
Again horses for courses. This boiler would be more than adequate for many situations. But carry on making your customers pay extra for something they may not need/want Just because you don’t like 25kw boilers .
“Of course a 25kw system boiler would be sufficient, it's doing a completely different job to a combI” .
Sorry you have to resort to petty comments enjoy you night
Jamieteatotal27/12/2019 21:04

Not completely different heat the heating water the same way. “Of course a …Not completely different heat the heating water the same way. “Of course a 25kw system boiler would be sufficient, it's doing a completely different job to a combI” .Again horses for courses. This boiler would be more than adequate for many situations. But carry on making your customers pay extra for something they may not need/want Just because you don’t like 25kw boilers .“Of course a 25kw system boiler would be sufficient, it's doing a completely different job to a combI” .Sorry you have to resort to petty comments enjoy you night


I said I wouldn't fit a 25kw combi boiler, I never said I wouldn't fit a 25kw system boiler. But if you could actually read you would know that wouldn't you.....
jay127/12/2019 19:20

I wouldn’t say any 25kw boiler is great.


Great that’s cleared that up . Love keyboard warriors. Good luck getting a boiler to run efficiently if your oversizing for hot water, excessive cycling and it not running in condensing mode for long?

“You should be an electrician, you're not bright enough to be a heating engineer (lol)“
i have this boiler and it's fine. i have the vaillant's thermostat instead of nest, and it's connected via alexa. i've got an electric shower and cooker, so the boiler is just doing the heating mainly and hot water taps occasionally. the boiler was just under £1k less vat, filter £100 less vat and flue £100 less vat from a place round the corner from me, so this isn't a particularly exciting price. seems the norm to me - for parts without the fitting. i got all parts inc therm and pipes etc for approx £1500 - including a metal filter, CO alarm etc
Jamieteatotal27/12/2019 21:17

Great that’s cleared that up . Love keyboard warriors. Good luck g …Great that’s cleared that up . Love keyboard warriors. Good luck getting a boiler to run efficiently if your oversizing for hot water, excessive cycling and it not running in condensing mode for long? “You should be an electrician, you're not bright enough to be a heating engineer (lol)“


I don't oversize for hot water. I size correctly for hot water how do you not understand that????? And why would it be cycling when it will modulate down for heating and condense perfectly?? I'm guessing you're either a six week wonder or a plumber but either way you shouldn't be speccing heating systems
Edited by: "jay1" 27th Dec 2019
Mate, you’ve obviously had a bad Christmas calm down. Have to resort to petty comments again.
It’s only a deal if your in the market for this type of boiler. To say a 25kw boiler is no good a strange comment for a heating engineer. Like I said enjoy the rest of your night
Jamieteatotal27/12/2019 21:31

Mate, you’ve obviously had a bad Christmas calm down. Have to resort to p …Mate, you’ve obviously had a bad Christmas calm down. Have to resort to petty comments again.It’s only a deal if your in the market for this type of boiler. To say a 25kw boiler is no good a strange comment for a heating engineer. Like I said enjoy the rest of your night


I've had a great Christmas thanks. A 25kw combi boiler is awful, that's not a strange comment at all. If you think otherwise then more fool you.
jay127/12/2019 21:41

I've had a great Christmas thanks. A 25kw combi boiler is awful, that's …I've had a great Christmas thanks. A 25kw combi boiler is awful, that's not a strange comment at all. If you think otherwise then more fool you.


Even these thick ass heating engineers fail to understand the difference between kw output for Central Heating & Domestic Hot water OUTPUT
Edited by: "bagga212" 27th Dec 2019
Jamieteatotal27/12/2019 19:18

Great boiler but very expensive on parts. Heat added


7 years parts and labour warranty included though.
davewave27/12/2019 22:01

7 years parts and labour warranty included though.


5 years standard increased to 7 if installed by a Vaillant approved installer.
Edited by: "Jamieteatotal" 27th Dec 2019
bagga21227/12/2019 21:59

Even these thick ass heating engineers fail to understand the difference …Even these thick ass heating engineers fail to understand the difference between kw output for Central Heating & Domestic Hot water OUTPUT


Who's this aimed at? The output of a combi boiler will be lower for CH than DHW. A flat will need around 8kw for heating and an average 3 bed house will need around 13kw for heating so it's irrelevant most of the time when sizing for a combi boiler as the hot water output will be much more than the heating.
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