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they were crossed, but I got them back to sort it.

ran the boiler from cold heating just the unvented hot water tank. boiler started kettling after about 1 min. 7 mins 40c flow 7-8c difference. 15 mins 43c flow 8c difference. 20 mins 45c flow 10c difference. 25 mins 46c flow 9-10c difference. 30 mins 48c flow 10c difference. 35 mins...

still not sure if the pump is fubar, as the downstairs rads do get hot.

that one was out of stock. but ive ordered the same sort of thing. once I get it how do I go about testing? do I run the system upto temp then measure the drop between flow and return? p.s. my concern regarding the system setup stems from the fact the boiler may have been put in by the...

thought it was worth a punt. do you think the problem is the heat exchanger, pump, or boiler setup/pressure.

ok filled the heat exchanger with white vinegar for about 3-4 hours. then drained via the plug in the heat exchanger. result is same kettling. some interesting observations though: after turning on the boiler with the pump on full, after a minute or two the kettling started. so I touched...

really? the cheapest I can get a alpha 2 (not the L) is about £117. then ive goto fit it. would they sort the kettling at the same time, or is it one fault one fix?

im thinking change the pump now and see if it fixes the kettling problem too. ive seen an offer at screwfix on a Wilo Yonos Pico. I had heard wilo were bad, though this has a 5 year guarantee.

anyone?

Forgot to say in the first post, the plumber fitted secondhand one. To be honest I think my original pump was ok, but because they had the flow and return crossed, which I figured out about 3 weeks later, it made the old pump seem faulty.

ive got a grundfos alpha pro that my plumber fitted to replace my old pump, which he said wasn't upto the job when he fitted an unvented system and moved the pump upstairs. well its been running for a couple of months now, on and off as we are out most of the day, and tonight its decided to...

I have a rm unvented so similar. if this smell is organic in nature it might be a build-up of bacteria in the tank. I should check the temp settings on the Hot Water thermostat and immersion stats. if there set below 60c try increasing it to 60c and give a full heatup from the boiler, as this is...

is it ok or even a good idea to use softened water in a central heating system? this is partially related to another post. the heat exchanger is iron, but it feeds via an indirect coil an RM stelflow unvented. will using softened water cause corrosion?

anyone?

what about something like this...

wheres best place to get the thermometers?

sorry its like an addiction :) . ive goto drain down some water to get the x200 into the flow from the header tank.

I might turn off all the rads, as I don't want to loose all the inhibitor, drain down, take the drain out on the boiler then add x200 directly to the heat exchanger leave to soak, then refill and leave x200 in with another dose of x100. sound good?

that's what I was thinking, though the rads do get hot. he changed my pump because he said mine had poor flow. he put in a secondhand grundfos alpha pro, which seems to be ok. its almost as if the flow is restricted through the heat exchanger or maybe the burner pressure is too high?

thanks again Agile. last night I did a bit of a test: the flow pipe is slightly warm, im guessing due to it having a pilot light. anyway from a cold start the boiler starts to kettle after about 30-60 seconds. yet the flow pipe is barely any warmer. this is with the pump on setting 3. ideas...