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I am assuming that's Relative Humidity? (RH tells you how much moisture is in the air relative to the maximum amount the air can hold at that temperature). Therefore the 75% vs 55% would possibly just indicate that it's colder in the cupboard! :) (Lower temps = less moisture can be held) My...

Thanks, that's given me a good starting point to find out more! :) Several sites seem to say the same thing, that a tight fitting lid and inhibitor should prevent the algae... unfortunetly I have both already (or so I thought). I wonder if the fact that I have modulating flow controls (so lower...

Hi, Just had a look in my header tank and found the following: The white bits looked like 'mould' and the brown was what I could only describe as like soggy cardboard (in texture) and about 1-2mm thick covering almost 99% of the water surface. Does anyone know what the 'cardboard' like...

How about an anwer or response to my question Bunnyman? (afterall, I did provide the answer the this weeks trivia! lol)

What's the question? :) - I have a few technical questions such as why is the burner is so high during the first xx seconds!? (If this is due to a EU reg on emissions, what specifically is the reg?) & what is the modification to prevent this behavior? that I'm sure some knowledgeable engineers...

For the benefit of the OP (and anyone else reading who cannot access the CC (me included)) The following formula gives you the answer: Flow (l/min) = Power (kW) ÷ 4.18 (kJ/l/K) * 60 (s/min) ÷ ΔT (K) Assuming an average return temp delta of 25°C, then the flow rate through the...

How are you getting on?

I think the price is likely to change depending on the local council. I recently looked into this for a friend who had a new boiler fitted (by a RGI a few years ago) but the RGI didn't notify GasSafe/BC (..and there is a limit of 12 months from installation to notify apparently). Looking on...

I wondered if the OP's pump was wired directly to mains but looking at a standard Y-Plan wiring diagram and the OP's wiring, if OP confirm's the pump is the cable labeled below, it looks to be wired correctly. Either way, I don't think this has anything to do with the OP's initial issue...

You have told us what get's hot at the cylinder/pump. We need to know if there are one or two flow pipes coming from the boiler (possibly the top two). The tests I mentioned on Pg16 are at the boiler side, rather than near the cylinder/pump.

No. Please read the 2nd from bottom post on page 16 for the tests! DIA: Could this be a possibility? Original: Changed to: (with pump running)

The above tests are helpful but we need to know the layout of the pipework. Without knowing how many pipes are connected, we can only guess what is happening. So, we need to identify what is connected to the boiler. Please see my last post regarding tests before reconnecting the pump. In...

Can you also indicate on this drawing; With the pump disabled 1) Which pipe(s) get hottest when with 3pv in HW position? 2) Which pipe(s) get hottest when with 3pv in HW&CH position? With the pump enabled 3) Which pipe(s) get hottest when with 3pv in HW&CH position? At the...

Mike, The OP has a Danfoss HSA3 mid position valve (as mentioned earlier in the thread! :roll: ) - The middle port is AB, the CH port is A and the HW is port B in the manufacturers instructions and on the product itself. Hmm... yes, sometimes but in this case specific detailed information...