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Atag A325EC or Intergas Combi Compact HRE 36/30 ?
Which of the two would you go for, and Why?
I'm in Leicester, and am REALLY struggling to decide which to go for:-
They both have a SEDBUK Sap seasonal efficiency of about 90%, and both support a weather compensation sensor.
The intergas:
-is SO elegantly simple in it's design, with very little to go wrong (No diverter valve, no secondary heat exchanger, reduced number of sensors).
-BUT, only has about 56% Hot water efficiency (really not that great), and cannot be used with a Flue Gas Heat Recovery system such as a GasSaver to improve that weakness.
Now Flue Gas Heat recovery Units do seem to be very expensive (£700-£800), and so may take ten years or more to pay for themselves in fuel savings, ...they are therefore probably not really an option for me.
but then along comes the Atag, and:
-It has Flue Gas Heat Recovery built right in!!! But at only an additional cost of around £200 -£250 more than the Intergas boiler... this supposedly then gives me a DHW efficiency of about 80-85%. This extra couple of hundred quid would probably therefore be paid for by fuel savings in around just three years (according to my very rough reckoning).
-But the Atag is as complex as most other combi's... loads of parts, sensors, electronics, a diverter valve, secondary DHW heat exchanger (and then a tertiary one in the flue too!).
The size and aesthetics of the boilers are really not important to me, as it's going in a utility area.
I figure that the Atag (If it proves reliable in not requiring major replacement parts) may 75% pay for it's self by the gas that it saves if it lasts for 15 years or so. But IF it is going to cost me a couple of diverter valves during that time, or a number of sensors, fans, pump etc... then it might well end up being a false economy compared to the Intergas.
I have a solid mechanical and electronic engineering background, so can understand and diagnose these sort of systems pretty well. I can repair/replace many components myself (avoiding the gas regulating parts of the system of course). But if I get stuck, then I wonder what the Atag skill level amongst local RGI's and the availability/cost of parts is like out there?
So folks... Do I go for the simple boiler with the lower DHW efficiency, or go for the more complex boiler with much better DHW efficiency... Which do you think is likely to give the lowest total cost of ownership over 15 years?
Any of your thoughts, advice, ramblings, etc... will be greatly appreciated.
Thank you.... Craig.
Which of the two would you go for, and Why?
I'm in Leicester, and am REALLY struggling to decide which to go for:-
They both have a SEDBUK Sap seasonal efficiency of about 90%, and both support a weather compensation sensor.
The intergas:
-is SO elegantly simple in it's design, with very little to go wrong (No diverter valve, no secondary heat exchanger, reduced number of sensors).
-BUT, only has about 56% Hot water efficiency (really not that great), and cannot be used with a Flue Gas Heat Recovery system such as a GasSaver to improve that weakness.
Now Flue Gas Heat recovery Units do seem to be very expensive (£700-£800), and so may take ten years or more to pay for themselves in fuel savings, ...they are therefore probably not really an option for me.
but then along comes the Atag, and:
-It has Flue Gas Heat Recovery built right in!!! But at only an additional cost of around £200 -£250 more than the Intergas boiler... this supposedly then gives me a DHW efficiency of about 80-85%. This extra couple of hundred quid would probably therefore be paid for by fuel savings in around just three years (according to my very rough reckoning).
-But the Atag is as complex as most other combi's... loads of parts, sensors, electronics, a diverter valve, secondary DHW heat exchanger (and then a tertiary one in the flue too!).
The size and aesthetics of the boilers are really not important to me, as it's going in a utility area.
I figure that the Atag (If it proves reliable in not requiring major replacement parts) may 75% pay for it's self by the gas that it saves if it lasts for 15 years or so. But IF it is going to cost me a couple of diverter valves during that time, or a number of sensors, fans, pump etc... then it might well end up being a false economy compared to the Intergas.
I have a solid mechanical and electronic engineering background, so can understand and diagnose these sort of systems pretty well. I can repair/replace many components myself (avoiding the gas regulating parts of the system of course). But if I get stuck, then I wonder what the Atag skill level amongst local RGI's and the availability/cost of parts is like out there?
So folks... Do I go for the simple boiler with the lower DHW efficiency, or go for the more complex boiler with much better DHW efficiency... Which do you think is likely to give the lowest total cost of ownership over 15 years?
Any of your thoughts, advice, ramblings, etc... will be greatly appreciated.
Thank you.... Craig.