Priority Hot Water Central Heating Quote
Discussion
Just after a price sense check as I look to upgrade my aging system boiler to either a Viesmann 200 or Vailant Ecotec Pro. Skip to the end if you just want to see the prices.
Although a biggish house (3 floors, 176m2, 5 beds), it's modernish (2008) and well insulated and recent heat loss calculations show an 8kW heat loss. I was considering an air source heat pump (hence heat loss calcs) but they were starting at £7.5k (included upgrades to 18 rads) after the BUS grant so the boss has ruled that out.
A local heating engineer (who has been great) has quoted me for either of these options, which includes removal of old, refit to same position in utility, pipework changes to convert S plan to X plan, magnetic filters, magna clean, weather compensation and associated controllers. Heating is to 20 rads and HW to a 300l unvented cylinder.
Viessmann 200 10kW system boiler £4500
Vaillant Eco Tec Plus 10kW system boiler with various Vaillant wiring centres and controls £4250
Both inc VAT. Just wondering whether these feel about right. I am based in W Yorks BTW.
Although a biggish house (3 floors, 176m2, 5 beds), it's modernish (2008) and well insulated and recent heat loss calculations show an 8kW heat loss. I was considering an air source heat pump (hence heat loss calcs) but they were starting at £7.5k (included upgrades to 18 rads) after the BUS grant so the boss has ruled that out.
A local heating engineer (who has been great) has quoted me for either of these options, which includes removal of old, refit to same position in utility, pipework changes to convert S plan to X plan, magnetic filters, magna clean, weather compensation and associated controllers. Heating is to 20 rads and HW to a 300l unvented cylinder.
Viessmann 200 10kW system boiler £4500
Vaillant Eco Tec Plus 10kW system boiler with various Vaillant wiring centres and controls £4250
Both inc VAT. Just wondering whether these feel about right. I am based in W Yorks BTW.
What is the basis of your 8kW heat loss?
What's the worst you've seen in reality?
I've seen close to 8kW in reality, basically very cold, pretty windy and heating cranked up due to aged inlaws staying.
About 190kWh per day, averaged over 5 whole days!
That's in Devon, you're nearer the arctic...
Do you have any other heat source?
While I think most people would agree most domestic boiler are over sized, I would think twice about going as low as 10kW for an 8kW heat loss.
If your hosue starts from cold, how long will it take to get warm?
What's the worst you've seen in reality?
I've seen close to 8kW in reality, basically very cold, pretty windy and heating cranked up due to aged inlaws staying.
About 190kWh per day, averaged over 5 whole days!
That's in Devon, you're nearer the arctic...
Do you have any other heat source?
While I think most people would agree most domestic boiler are over sized, I would think twice about going as low as 10kW for an 8kW heat loss.
If your hosue starts from cold, how long will it take to get warm?
I had 2 surveys done for a heat pump and both came back with a 7.8kW heat loss based on the MCS heat loss calculator and the Heat Engineer calculator. If I was going for a heat pump then it would have been an 8 or 10kW unit. However, I agree that 10kW on the boiler sounds a little bit low.
Do the prices seem about right?
Do the prices seem about right?
Mont Blanc said:
10kw for a 5 bed house? Are you sure that has been specced right?
My boiler is a Baxi MegaFlow and it's 32kw!
Unless it's piped in 28mm it can't put 32kW into the pipework!My boiler is a Baxi MegaFlow and it's 32kw!
Ours is 30kW (I didn't choose it, builder had it fitted) and once it ramps up the flow temp goes up a degree a second so within a few seconds it's modulating down.
That said, 10kW does sound low - we had an old Potterton Suprima before which I think was 12kW (fixed) and we came back from holidays one autumn and it had been unusually cold. It took 24hrs to warm the house up - the boiler just sat there not able to get the flow above 50C.
Sheepshanks said:
Mont Blanc said:
10kw for a 5 bed house? Are you sure that has been specced right?
My boiler is a Baxi MegaFlow and it's 32kw!
Unless it's piped in 28mm it can't put 32kW into the pipework!My boiler is a Baxi MegaFlow and it's 32kw!
Ours is 30kW (I didn't choose it, builder had it fitted) and once it ramps up the flow temp goes up a degree a second so within a few seconds it's modulating down.
That said, 10kW does sound low - we had an old Potterton Suprima before which I think was 12kW (fixed) and we came back from holidays one autumn and it had been unusually cold. It took 24hrs to warm the house up - the boiler just sat there not able to get the flow above 50C.
Ours was all designed/specced a few years ago by a company that does that sort of thing. House is just over 3000 sq ft. All underfloor downstairs, rads upstairs. Insulated hot feed also goes underground to the detached garage for sink etc in there.
Mont Blanc said:
Sheepshanks said:
Mont Blanc said:
10kw for a 5 bed house? Are you sure that has been specced right?
My boiler is a Baxi MegaFlow and it's 32kw!
Unless it's piped in 28mm it can't put 32kW into the pipework!My boiler is a Baxi MegaFlow and it's 32kw!
Ours is 30kW (I didn't choose it, builder had it fitted) and once it ramps up the flow temp goes up a degree a second so within a few seconds it's modulating down.
That said, 10kW does sound low - we had an old Potterton Suprima before which I think was 12kW (fixed) and we came back from holidays one autumn and it had been unusually cold. It took 24hrs to warm the house up - the boiler just sat there not able to get the flow above 50C.
Ours was all designed/specced a few years ago by a company that does that sort of thing. House is just over 3000 sq ft. All underfloor downstairs, rads upstairs. Insulated hot feed also goes underground to the detached garage for sink etc in there.
We have a Vitodens 100-W B1HF and it’s been rock solid. It’s built like a tank.
Ours is S plan so no priority. It’s a 25kw, because Heatable, but is range rated to 60%. It never goes above 45% modulation. So that I think is 11.25kw, but theres discussion of that on the other thread. I think they overshoot when needed. Anyway, 11 rads and a 205L unvented tank. Honestly, it heat the rads and tank up at the same time no issues. Set to 60c flow.
However if the HW priority means you can set CH and HW at different temps it’s probably worth it for that.
Ours is S plan so no priority. It’s a 25kw, because Heatable, but is range rated to 60%. It never goes above 45% modulation. So that I think is 11.25kw, but theres discussion of that on the other thread. I think they overshoot when needed. Anyway, 11 rads and a 205L unvented tank. Honestly, it heat the rads and tank up at the same time no issues. Set to 60c flow.
However if the HW priority means you can set CH and HW at different temps it’s probably worth it for that.
Edited by PT1984 on Sunday 29th September 21:48
Edited by PT1984 on Sunday 29th September 21:49
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