To avoid 'melting' heat exchangers, choose one made of stainless steel. Keston celsius 25, glowworm sxi, vaillants and viessmann vitodens 200 meet this criteria.
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Did you forget the Halstead Eden on purpose? Isn't there a Ravenh... sorry forget them.
I guess you meant "dissolving"- into the condensate trap - rather than melting. (Even Sbi's don't melt!) It Does seem to be aproblem. But if its so important why do Bosch Greenstars have Al-Si heat exchangers. Can't get an answer to this - maybe it's all overcome by firing downwards, or something.
I guess you meant "dissolving"- into the condensate trap - rather than melting. (Even Sbi's don't melt!) It Does seem to be aproblem. But if its so important why do Bosch Greenstars have Al-Si heat exchangers. Can't get an answer to this - maybe it's all overcome by firing downwards, or something.
croydoncorgi. Perhaps you are anaware that circuit was going on about this very subject (reduction of access air) on Plumbing Pages. He was (if I can remember correctly, intending to reduce fan speed on his Worcester boiler to achieve this. Could it be that reduces air flow has resulted in hot spots on the heat exchager resulting in failure he speaks of at the top of the thread.
On a fan flued boiler, standing pilot has sufficient power to heat the water in the heat exchanger well past the thermostat cut off point to pop seals on the heat exchanger should the fan fail. I dread to think what the consequences would be to temper with manufacturer's prescibed air flow through the combustion chamber.
On a fan flued boiler, standing pilot has sufficient power to heat the water in the heat exchanger well past the thermostat cut off point to pop seals on the heat exchanger should the fan fail. I dread to think what the consequences would be to temper with manufacturer's prescibed air flow through the combustion chamber.
DP you are getting rather carried away here. It is not possible in practice to reduce air flow thru a fan flued boiler to any great extent since the air pressure / velocity switch will cease to operate. Manufactures design their appliences such that should the fan start to run more slowly due to say dry bearings, or some foliage starts to restrict the flue, the boiler shuts down. In this respect this type of boiler is far safer than non fanned. If you work in the industry you shown be only too aware of this.
With regard to the pilot boiler with a failed fan, you are incorrect, a pilot flame popping seals? LMAO. If the fan stops, then the pilot goes out a few hours later due to lack of oxygen.
With regard to the pilot boiler with a failed fan, you are incorrect, a pilot flame popping seals? LMAO. If the fan stops, then the pilot goes out a few hours later due to lack of oxygen.
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worc cbi range of boilers have acast iron he they do not melt,o rings give up need replacing,talk nicely to worc they may replace them under warrenty.greenstars have a silicone additive in the he when cast to prevent flaking/oxidising,hope this helps
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