I have endeavoured to see how much Evohome has saved me. I installed it in December 2014. It appears to be saving me about 3,000 kWhs per annum. At my current rate for gas that is about £100 per annum. I have therefore got a good chunk of the cost back. I have though always looked on the main benefit being the control it gives.
Evohome Savings
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I've only had evohome installed for a few weeks now, so I'm not going to see any benefit until the colder nights start creeping in, but what I have noticed is that the odd room will call for heat as expected, but that is taking some getting used to because previously the only room that could call for heat was the living room (where the old room stat was located) and that would hardly ever call for heat in the summer because of a bloody great plasma telly in there that keeps the room fairly warm. So I might actually see my summer gas usage increase compared to previous years, unless I go around and tweak the set points in those rooms that do occasionally call for heat, but the whole point of me installing evohome was so that I could heat rooms independently, so I'm not too bothered as we should end up more comfortable, for instance I could sometimes end up shivering a bit in the conservatory whilst the missus was nice and toasty in the living room.
Also we've recently got a dog and I used to have to leave the living room door open to let some of the heat dissipate, but sometimes we don't want the dog going in there, so closing the door would cause a heat trap and the rest of the house would be freezing. Now I can close the living room door and not worry about it.
I also work from home and didn't like the bedrooms upstairs being heated whilst the kids are at school and I'm sat in the downstairs office all day, so I'm looking forward to seeing what my gas usage is like next year - this house is a bugger to heat, I normally get through between 23-26,000kwh of gas per year.
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I don't work in cash, its irrelevant because the rates change, but annual KW usage doesn't, before evo home I was using 25000KW annually, after installation, I use about 20000KW, so I use about 20% less.
So pay back 4 installation will be about 4-5 years. £800, 9 zones, i self installed.
Evohome saves money, but I prefer the control options and comfort levels.Last edited by frankmalia; 25 June 2021, 02:26 PM.
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Originally posted by frankmalia View PostI don't work in cash, its irrelevant because the rates change, but annual KW usage doesn't, before evo home I was using 25000KW annually, after installation, I use about 20000KW, so I use about 20% less.
So pay back 4 installation will be about 4-5. £800, 9 zones, i self installed.
Evohome saves money, but I prefer the control options and comfort levels.
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I think that establishing a meaningful definitive cost saving is almost impossible as there are so many variables to take into account. Duration of heating periods, outside temperatures and weather conditions, inside temperatures and comfort levels achieved, to name but a few!! As elusive as trying to pin down an mpg figure for a car!!
I think that if you keep doing all the right things when setting up Evohome ie make sure that make use of all the fuel burnt, then an optimum cost/comfort balance will be achieved
Steve
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Well, as far as I can see the Evohome installation has had no effect on annual usage, although in the year of installation (2016) I did actually come down 3GJ. I've been consistently on 17GJ per annum since, which is the same usage that was registered for 2015 but it should be noted that between 2010-2014 we averaged at 26GJ. The increased level of comfort throughout the house however is immense, in particular in my home office where it did occur once in a while that I couldn't feel my fingers while typing.
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Originally posted by Jenks View PostI think that establishing a meaningful definitive cost saving is almost impossible as there are so many variables to take into account. Duration of heating periods, outside temperatures and weather conditions, inside temperatures and comfort levels achieved, to name but a few!! As elusive as trying to pin down an mpg figure for a car!!
I think that if you keep doing all the right things when setting up Evohome ie make sure that make use of all the fuel burnt, then an optimum cost/comfort balance will be achieved
Steve
2017 = 18,739 (before Evo Home)
2018 = 19,532 (before Evo Home)
2019 = 18,962
2020 = 19,069
2021 = 19,827 (Aug and Sept assumed as same as last year)
The variables that will make it nigh on impossible to show a saving.
Weather conditions tied into holidays during those weather conditions. I.e. the amount of time spent at home when you need heat.
Lockdown and working from home has seriously affected consumption, lack of winter holidays during Covid.
Retiring and spending more time at home...
The following is not like for like (i.e. measured from Sept to August), These are figures from previous years Jan to Dec
2002 = 17071
2003 = 29678
2004 = 21281
2005 = 21281
2006 = 21248
2007 = 26190
2008 = 23414
2009 = 22969
2010 = 23736
2011 = 22936
2012 = 24680
2013 = 28467
2014 = 20726
2015 = 22836
2016 = 23380
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Indeed, it is not the cost, as charging rates will vary, but the consumption. My figures show:
2007 20,501.00
2008 20,967.00
2009 22,421.51
2010 21,818.00
2011 13,626.82
2012 14,775.92
2013 22,340.89
2014 18,190.47
2015 17,866.53
2016 17,723.57
2017 14,903.10
2018 19,773.10
2019 15,662.00
2020 17,608.00
Evohome was installed at the end of 2014. I live in a four bedroom detached house in the NE.
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I would not be able to recommend anyone install EvoHome to save money. Some may eventually achieve payback, but it is by no means guaranteed. If you have a stable usage requirements, simple thermostatic valves and a time clock my well meet your needs at lower overal cost and with far less complexity. However, if you cannot achieve a stable balance between zones, EvoHome is excellent and worth every penny.
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Originally posted by CT1 View PostI would not be able to recommend anyone install EvoHome to save money. Some may eventually achieve payback, but it is by no means guaranteed. If you have a stable usage requirements, simple thermostatic valves and a time clock my well meet your needs at lower overal cost and with far less complexity. However, if you cannot achieve a stable balance between zones, EvoHome is excellent and worth every penny.
That said, before I had Evohome I used to set the living room at 24C just to create the trigger for the heating to come on and allow the radiators upstairs to get hot. If the UFH in the living room didn't have it's own autonomic flow control I would have probably had to set that way higher and that would have shown on my bill for sure.
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Like Gordanb3,
I can not prove I have saved money, but the fact that we mostly use the living room at night and the ability to just heat that zone while the two spare bedrooms get nothing unless we have visitors feels like we should save money but it is all about the ability to get heat where and when you want / need it.
But look at yearly usage and say yep i have saved X is pretty impossible IMO (for me anyway)...
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Originally posted by M J View PostLike Gordanb3,
I can not prove I have saved money, but the fact that we mostly use the living room at night and the ability to just heat that zone while the two spare bedrooms get nothing unless we have visitors feels like we should save money but it is all about the ability to get heat where and when you want / need it.
But look at yearly usage and say yep i have saved X is pretty impossible IMO (for me anyway)...
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I have HeatGenius on a Combi and it's saved me a ton, even in my little flat:
2016: 5175
2017: 4903 (-5.2%)
2018: 4864 (-1%)
2019: 3333 (-31.5%)
2020: 3574 (+7.2%)
2021: 3591 (+0.4%, forecast)
Have a guess which year I installed it...
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