New boiler quotes

Mistermeaner

macman said:

Why did one quote a 30kW boiler and the other a 24kW? Did they actually both do the maths?

don't know - the one that quoted 30Kw visited the property, the one that quoted 24kw did a vid call

current boiler is 28kw

I've done a few sizing things online and give or take either will do the job based on the number of rads we have etc. - apparently sizing is much more important for combi water heating but as we're on a system boiler its not so critical

Corrections from those more knowledgeable welcomed

If it matters we have 11 rads + 3 towel rails. Out house is 3 floors, 3 bathrooms, 4 bedrooms, and around 2500sq ft

BUFF

Mistermeaner said:

hi all, 2 quotes so far:

-Local worcester bosch installer, £2850 - 30kW boiler, includes cehm flush of system, and mag filter thing + agreed to swap a radiator for us inc in price (we supply radiator). Re use existing controls. 12 year guarantee if we get serviced each year (service plan £7/month)

- Eon worcester bosch 24 kW boiler, £3500, includes chem flush and mag filter thing. Re-use existing controls. 5 year guarantee (subject to service plan), 10 year guarantee if we take out extended service plan

What are your existing controls?
I strongly suspect that upgrading them to current WB (WB use a proprietary communications protocol EMS for modulation  that 3rd party controls can't access) will pay for themselves with gas savings over the lifetime of the boiler. & if you go with the WB installer the WB controls will be warrantied for the same length as the boiler (subject to the usual t&c) so also 12 years.

plumb1_2

macman said:

4 hours? How did they flush it adequately in that time?

They just pour or inject some F3 into the system, let the heating run for 10 minutes while they drink a brew. Then just drain down. That’s your chemical flush. And not a powerflush.
Powerflush min 4 hrs

Mistermeaner

BUFF said:

What are your existing controls?

I strongly suspect that upgrading them to current WB (WB use a proprietary communications protocol EMS for modulation  that 3rd party controls can't access) will pay for themselves with gas savings over the lifetime of the boiler. & if you go with the WB installer the WB controls will be warrantied for the same length as the boiler (subject to the usual t&c) so also 12 years.

hi existing controls are honeywell - these were put in when we had the megaflo fitted about 3 years ago. There is one control panel for the megaflo and a separate thermostatic one in the hall that controls heating. Advice we had from both who visited is that the honeywell controls are good and no point replacing them

ThisIsWeird

Mistermeaner said:

BUFF said:

What are your existing controls?

I strongly suspect that upgrading them to current WB (WB use a proprietary communications protocol EMS for modulation  that 3rd party controls can't access) will pay for themselves with gas savings over the lifetime of the boiler. & if you go with the WB installer the WB controls will be warrantied for the same length as the boiler (subject to the usual t&c) so also 12 years.

hi existing controls are honeywell - these were put in when we had the megaflo fitted about 3 years ago. There is one control panel for the megaflo and a separate thermostatic one in the hall that controls heating. Advice we had from both who visited is that the honeywell controls are good and no point replacing them

Photo of your existing controls, please?

I suspect you'll be significantly better off with new, WB-tailored, Smart controls. (Dare I suggest they don't want to get a sparky in?!)

BUFF

Mistermeaner said:

BUFF said:

What are your existing controls?

I strongly suspect that upgrading them to current WB (WB use a proprietary communications protocol EMS for modulation  that 3rd party controls can't access) will pay for themselves with gas savings over the lifetime of the boiler. & if you go with the WB installer the WB controls will be warrantied for the same length as the boiler (subject to the usual t&c) so also 12 years.

hi existing controls are honeywell - these were put in when we had the megaflo fitted about 3 years ago. There is one control panel for the megaflo and a separate thermostatic one in the hall that controls heating. Advice we had from both who visited is that the honeywell controls are good and no point replacing them

Well, at least they aren't 15-20 years old like the existing boiler but the Honeywell definitely won't be able to make the most of the WB boiler's modulation abilities via EMS & therefore maximimise efficiency & savings.  I would guess that between that & load/weather compensation 5-10% saving should be achievable. You can work out how much that might save you over a typical boiler life of 15 years (& the controls would be warrantied for 12 years of that, same as the boiler).

The RF version of EasyControl is literally plug in (receiver plugs into a slot in the boiler & the control panel plugs into a 13A socket). Or of course you can use the existing cables for a wired version.

Mistermeaner

My existing controls 

Mistermeaner

Forgive my ignorance but how do fancy controls save so much money ; we have TRVs and set our controls to come on and off as required plus we’re pretty good at turning it down if we’re away for a few days etc 

BUFF

Modern boilers modulate their burn to match their output to demand, if they can use a bus level communication (Opentherm, EMS etc.) with the room 'stat(s) they can do so more accurately.
If they can use load compensation, weather compensation* or both they not only can do that but they can get ahead of the curve, so to speak, so that they not only don't overshoot but they can also proactively reduce the flow temperature which on a condensing boiler will improve efficiency. You could do that manually but it wouldn't be as convenient or as efficient as letting the controls do it automatically.
There are also other benefits for the boiler/system that come from running cooler that typically lead to better reliability/longer life.

You might find this interesting. Your existing CM927 is TPI & can't communicate at bus level with a WB boiler.
https://www.heatsy.co.uk/blog/outdoor-weather-compensation-vs-load-compensation-vs-tpi/ 

* the WB EasyControl uses local weather data from the internet rather than an external sensor for weather compensation

FreeBear

Mistermeaner said: Forgive my ignorance but how do fancy controls save so much money

With a programmable thermostat (which I believe the CM927 is), you can set different temperatures throughout the day. So early in the morning, you could set at 18°C in time for breakfast. Drop it down to 16°C during the day, and boost it to 20°C so that you are toasty in an evening. And then drop to 16°C overnight to keep things ticking over. The alternative with a dumb control is to set the thermostat to 19°C and program the timer to come on a couple of hours in the morning and 4-5 hours in the evening.

Research suggests you can save 10% or more with a programmable thermostat. In reality, the saving is more likely to be around 5%.