15 to 21kw or 21 to 26kw boiler?

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Looking to replace my oil fired Camray 3 70/90. Output of existing boiler is 20 to 26 kw.

The Grant Vortex range have an ECO Utility model that has a range of 21 to 26kw, but they also have a Pro Utility that does 15 to 26kw.

The boiler is in my garage and it powers a 250 litre heat store - never had a problem with the existing boilers capability to maintain the heatstore and hot water.

Am I better with the 21 to 26 or the ECO model with the wider range of 15 to 26kw?

Thanks
 
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Most of these boilers can be 'range rated' by nozzle size & adjustments. Your installer will be able to commission & adjust as required. A lot of the time they are set for the lowest boiler output regardless.

So, the output of your existing boiler should be confirmed & the new boiler ouput adjusted to match it or to match your home's heat-loss.
 
Thanks for the reply, I know it's a 0.75 nozzle and looking in the manual that puts it at 23kw.

I guess my question is, am I better to have the 21-26kw one and run it at 50% of it's range, or the 15-26kw one and run it at 75% of it's range?

Which would give the better efficiency?
 
Perhaps it would be better if you do a heat-loss calc for your home. There's every chance your existing boiler is oversized. Set up your new boiler to match your heat-loss. So that may need the boiler with a lower output than 21KW. For the optimum performance on oil boilers you want it running for a long time, not on & off cycles. So to avoid this cycles you need to match your requirements.
HTH
 
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Well said !

With consistent good advice like that he should be seen in the CC area!
 
Well said !

With consistent good advice like that he should be seen in the CC area!

Well Tony, my application form is in, they have details of all my ACOP qualifications, a photo of my old 'U' gauge & the fag lighter I use to find the gas leaks............What more can I do???!!!.............. ;)

Thanks Tony
 
Oil boilers are usually supplied with the output set to the median of the range.

The boiler cannot modulate and changes to the upper or lower range are achieved by using different nozzles and oil pump pressures.

The Grant Eco and Vortex are two slightly different ranges, one is a cost reduced version.

Also look at the Worcester Camray range, these come with a 5 yr warranty as standard when installed competently by a trained installer.
 
Oil boilers are usually supplied with the output set to the median of the range.

The boiler cannot modulate and changes to the upper or lower range are achieved by using different nozzles and oil pump pressures.

The Grant Eco and Vortex are two slightly different ranges, one is a cost reduced version.

Also look at the Worcester Camray range, these come with a 5 yr warranty as standard when installed competently by a trained installer.

Simond the outputs; I think it must vary from manufacturer to manufacturer regarding 'factory' settings.
Wouldn't recommend a Worcester Tupperware Bosch. Worcester made great boilers in the past but not in 2011.
 
I should probably also have mentioned that the existing boiler is coupled to a Gledhill 250 litre heatstore - I'd guess this makes the sizing simpler?
 
I should probably also have mentioned that the existing boiler is coupled to a Gledhill 250 litre heatstore - I'd guess this makes the sizing simpler?

Oh my Gawd I'd replace that also mate, these Sludgebuckets leak like a new baby!! If you've got the incoming mains water flow rate & pressure? Fit a nice new unvented cylinder.
 

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