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Old 20 February 2013, 17:57   #1
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Another Boiler question

Reading the other thread with interest as I have a similar question. We're looking at changing our heating system completely as it's 20+ years old and the radiators are pretty ripe, the hot water cyl leaks and despite being a small house the boiler burns more fuel than the Argentine navy with a nuclear sub on their tail.

All heating here is oil fired and due to the nature of our water supply a combi is not an option, so it will be a balanced flue oil-fired boiler feeding radiators and a conventional hot water cylinder with a gravity feed cold water system.

Options locally are a Worcester Bosch Camray Utility condensing boiler, or a Mistral CKUT3 condensing boiler, similar thing, different manufacturer.

So, any views on which would be the better product? Both have decent parts backup and support, and no other makes do here, so any alternatives are unlikely to be worth considering.

Our heating bill is about 2500 a year so I think I'm prepared to pay the extra for a condensing model -the WB supplier also has non condensing models available and they are cheaper, but 10% fuel saving will cover the cost difference in a couple of years.

Views please?

Ta
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Old 20 February 2013, 18:19   #2
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Quote:
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despite being a small house the boiler burns more fuel than the Argentine navy with a nuclear sub on their tail.


BTW go for the condensing boiler
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Old 20 February 2013, 19:35   #3
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Aye, but which make out of the two, that's the question?
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Old 20 February 2013, 20:38   #4
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How come non of your guys think green? What about a complete retrofit, with a radiant floor heating or reusing the radiator system but going to a heat pump? Heat pumps are super efficient, but may not produce enough thermal conductivity depending on ambient temps. A solar thermal run during the day with hot water storage can offset much of this dependent on snow load. A solar photovoltaic system can completely offset the power bill required. Green can almost always save money. Oil burning? Yuck!
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Old 20 February 2013, 21:10   #5
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From what you list : the NON condensing worcester ( danesmoor) is the best by a mile, long lived and reliable proven good unit.
new W/B condensing oil range is universally disliked by heating engineers.

oil condensing boiler of choice would be a grant vortex with a fernox tf1 filter on the return pipe. with fully pumped s- plan control system with room thermostat and trv's on the radiators.
proper flushing out of flux residue on a new system is the key to it lasting and not leaking due to pinholeing.

I am an Independent Heating engineer of 30 years .
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Old 21 February 2013, 03:58   #6
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One or two of the glass vacuum tube type solar water heaters linked into the hot water storage tank is worth a look, IMHO...
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Old 21 February 2013, 04:06   #7
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Thanks Mr Camel. I've since looked again at the list I was sent and the non condensing ones (or at least I think that's what is meant by "standard efficiency") are not WB but are Warmflow, what's the view on those please?

Efficiency rating on the website is listed as 85.6% for the Warmflow U90, so it's well behind the 93.2% for the WB Camray but having had reliable non condensing boilers for many years I am far from convinced that the extra complication is worth it and it's only got to go wrong once a year to wipe out the fuel saving on repair costs.

Given the concerns on the Camray, what do you think of the Mistral boilers for the condensing option or haven't you had any dealings?

On the greenie side, solar water heaters are slightly effective here but the other options aren't.
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Old 21 February 2013, 04:16   #8
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How come non of your guys think green?
Have you factored into that where Bogmonster lives?
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Old 21 February 2013, 04:37   #9
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Personally I wouldn't go condensing especially in your locale. The last couple of years up here in the balmy latitudes have seen loads of boiler breakdowns due to freezing condensate pipes. They only breakdown when it's cold We've got a "conventional" Trianco, I know it's not on your list, but it consistently runs at 90%+ eff. We've got solar PV & I'm also looking at ground source heat pumps to run our underfloor (wet) heating, the energy situation can only get worse.

Anyway, why are you buggering about burning oil, I thought you'd be sheep sh1t powered down there
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Old 21 February 2013, 04:43   #10
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Anyway, why are you buggering about burning oil, I thought you'd be sheep sh1t powered down there
They're selling all of that to the Argentinians to power their Navy
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