Why is your condensing combi boiler not condensing. #saveenergy

#saveenergy #gassafe #energy #energysavings Derek takes a look to see why condensing boilers are not condensing and what we can do about it to make them condense and save us gas, money and co2 production.

[fjrxj]

Not sure how you find the time to produce such informative videos but yet again another brilliant presentation, learning so much from them. Mega Thanks.

[jimmaxwell]

The problem for customers, who have had a boiler 'mis-installed/poorly commisioned', is that to call out an engineer to range rate the boiler, it will cost you £150 just to get them through the door, thus negating a couple of years savings. The 80% of 80% of 80% should now be suing their installers for not doing the job properly in the first place. On another note, great content, presented well and ultimately illuminating. Quick question....after range rating a WB system 30KW CDI, (all button controlled) must you then re run a telegan flue analysis?

[patrickoregan]

Fantastic content Derek! You make it very interesting and have a great way of teaching without mind clogging jargon . About time we got our heads around this as fitters. Looking forward to the weather comp video . Cheers

[jockster]

Enjoyed this, much of this is something I've often spoken about, trying to explain to customers that they would be better having a smaller combination boiler than the 37kw recommend by a competitor.. thanks for your efforts, I'll use this video for future reference for customers..
Great stuff thanks for your efforts 👍😊

[philiponsolent]

I along with many others have suddenly started to take an interest in the white box in the corner, so these videos are very useful. The only problem I have is a 30kW boiler that is only six years old. If I had taken the trouble to investigate this type of information before it was fitted, I would have gone for a smaller, cheaper boiler. Marketing is a very powerful tool. Look forward to the video regarding weather compensation.

[amcluesent]

Good advice, I've used the service menu on my Greenstar CDi 30 to set Max. output (heating) to be 50%. Also set the HW temp so I only need a tiny amount of cold water mixed in the shower. I always use a dishwasher so don't need piping hot water for doing dishes.

[louisdisbury]

Great Video very few engineers understand about rating boilers for different homes.

[WEYHARRY]

Brilliant rebound, on commissioning a boiler I do hot water then heating, on a service I just do high and low.

[markjones]

Very interesting video Derek. Only thing I would add is, even if you get the return temp down to 54 how much gas are you saving, 4% at best, but probably 3 or even 2%.

So between £20 and £40 per year on a £1000 gas bill. Seems pointless to me.

[chrissmith]

When we moved into our newbuild in 1997 all the radiators were very undersized, but at least the builder had installed a very nice Vaillant Thermocompact ECo max 18KW boiler. I quickly replaced all the radiators with double panel ones with thermostatic valves on upstairs rads in the bedrooms. The bigger rads allowed a lower flow temp and cooler return. I also moved the CH thermostat from hallway to the lounge and replaced the analogue one with a digital type. Probably saved myself a fortune in heating costs since.... The builder had also installed a fan assisted gas 'coal effect' fire, which was about 40% efficient as it blew most of the heat into the garden, that was replaced by a glass fronted balanced flue DruGas log effect fire, which is about 90% efficient and works even during power cuts, its max output is 6Kw so will keep house warm while the electrickery is off...

[chrisshave]

Wow I learned so much from your vid many thanks! Got some good questions to ask the companies quoting for my boiler replacement!

[cloudyskies]

Turned my water down to 45 degrees and also the preheat function is now off. I switched off my weather comp on my Worcester as the heating was on longer than necessary and using more gas. It’s a digital one so it comes from the local weather services via a Worcester server then the controls are updated. Maybe then I also had all radiators on maximum.

[RDR]

How can i do my calcs? I have 16 rads, 3 of which are towel rails, 11 are double rads and 1 single. I have an 835 Vailant Combi. Modern home, good insulation etc, i also run underfloor heating off the boiler in one 20sqm room. What should i rate the boiler down to please?

[RobinHarris-nfyv]

I’ve just an Ideal vogue system boiler installed with hot water priority and weather comp.

The boiler runs mostly around 45 to 50 deg flow and 38 to 45 return on heating so is always in condensing mode.

With hot water it’s heating at 80 deg, but that’s only for 40 mins a day in total

[willlomas]

Food for thought Derek... great stuff cheers pal.

[nattyco]

Thank you. Couldn't some of the discrepancy between the boiler set water temp and the actual temp coming out of the tap depend on the accuracy of the temperature sensor and thermostat in the boiler?

[bobwhittaker]

hi can you please supply a link to your explanation on heat only boilers ie range rating .thanks

[johnf]

I have always wondered why my Vaillant combi condensing boiler still 'plumes' even with the flow temperature is only 50c. Surely all the water vapour should condense and flue gas should be invisible?

[danhaire]

Great video thanks. I'm considering adding a smart thermostat to my home which do weather compensation via the internet, do you think that is a good approach or should I hardwire a dedicated outdoor sensor?

[josephborg]

I'm using a Tado which I believe includes weather compensation . Do you think I should still Install an external weather compensator.