high efficency boilers

paulmallon

i have a grant 70/90 boiler in about 5 years and im wondering are there any modern ones which would be much more efficent. I am driving about 13 radiators ,not all the same size plus the hot water system,(i can heat either seperately). I hear about these condensing boilers,what are they about?

JamesM

paulmallon wrote:

i have a grant 70/90 boiler in about 5 years and im wondering are there any modern ones which would be much more efficent. I am driving about 13 radiators ,not all the same size plus the hot water system,(i can heat either seperately). I hear about these condensing boilers,what are they about?

Grant explain their condensing boilers here. http://www.grantengineering.ie/cond_util.htm
Remember that you already have quite an efficient boiler, so you would not have the same gains as you would, changing from a 20 year old model. The condensing boiler also costs about euro1000.00 more than a standard boiler by the time it is installed.
Jim.

ednwireland

dont forget the sedbuk rating system doesn't allow for non-condensing boilers to be rated above c even though they are tested at 95% eficiency. i think all boilers in the uk have to be condensing but if your return temps arent low enough you lose efficiency in the condensor.
heres part of an email i got from an engineer at grants


Note; When calculating the seasonal efficiency of a standard oil boiler the part and full load are used in the calculation, however they are capped at 91% and 92 % respectively, so no standard boiler can achieve a seasonal efficiency above 85.7% hence the large difference in the two figures.

i bought a grant multipass last year rather than buying a condensing boiler for twice the price replacing a burnt out 20 year old boiler and have seen quite a signioficant reduction in oil burn