Joining the Renewable Heating Hub forums is completely free and only takes a minute. By registering you’ll be able to ask questions, join discussions, follow topics you’re interested in, bookmark useful threads and receive notifications when someone replies. Non-registered members also do not have access to our AI features. When choosing your username, please note that it cannot be changed later, so we recommend avoiding brand or product names. Before registering, please take a moment to read the Forum Rules & Terms of Use so we can keep the community helpful, respectful and informative for everyone. Thanks for joining!
Last seen: Nov 10, 2026
@old_scientist You will probably find that most of it has settled out in the rads or the volumiser. Anywhere where there isn’t laminar flow. I had ...
That’s not biofilm. Looks like a very fine particulate rust, but fine enough that I doubt it will do too much harm. If the cleaner doesn’t shift it yo...
@toodles must be a PW2 thing, I understand the 2 versions use different battery chemistry. Im semi intentionally abusing my battery, it gets 3 full cy...
@toodles weird. It’s only started doing this very recently?
@toodles never seen that before, not on mine.
@old_scientist That sounds like text book biofilm (I used to work on very high purity water systems for IV use and experienced it several times). I...
@toodles Here’s mine from yesterday. We are 5 person household at the moment, the big peak is the DHW cycle.
@old_scientist Thats good, it would have explained the colour at least. With the glycol, possible organic acids complicate the potential causes o...
@old_scientist To exclude it being a biofilm of sulphate reducing bacteria, if you sniff the brownish water, does it smell sulphurous or eggy?
@toodles sorry it’s not worked out for you, not much of summer left anyway. It seems you have all your heavy loads in the evening whereas I schedule...
Don’t forget, it’s not the headspace gases that are the issue. It’s the dissolved oxygen in the heating fluid that’s key. Either there wasn’t any/insu...
The colour suggests ferric oxide, ie rust. Or something of that colour that has been added to the system, but I think that unlikely. My sludge is bl...
SPONSORS
Degrees of Separation
Latest Posts
-
Should I change my cylinder when changing from a gas boiler to a heat pump.
I have 178 L Gledhill unvented cylinder which was fitte...
By David , 3 hours ago
-
Should I change my cylinder when changing from a gas boiler to a heat pump.
I have 178 L Gledhill unvented cylinder which was fitte...
By David , 3 hours ago
-
RE: Plug and play solar. Thoughts?
Impressions so far from the one I've installed are that...
By EtchedPixels , 5 hours ago
-
-
@batpred The Daikin temperature probe protrudes from th...
By Toodles , 8 hours ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
@editor And as an occasional contributor, may I say wel...
By Toodles , 10 hours ago
-
RE: Should Households Who Can Afford It Pay More for Energy to Help Those Who Can't?
They don't have to try. Our entire system is d...
By EtchedPixels , 11 hours ago
-
RE: Why don't people choose heat pumps?
Fair enough. I guess I was thinking of pipes that run ...
By JamesPa , 11 hours ago
-
RE: How Can I Prove Coal Was My Main Heating Source Without Receipts?
Got excepted for the grant now so thanks for the replie...
By Chilli304 , 15 hours ago
-
Daikin Altherma 3 R F+W, room thermostat control, weath...
By JanHarley , 16 hours ago
-
RE: Buffer tank on a 2 x 14kw Ecodan system
Pretty much as I had guessed in my crude scaling from m...
By JamesPa , 19 hours ago
-
RE: Help me keep the faith with my air source heat pump installation
Well you have a vibration generator running at some fre...
By bobflux , 1 day ago
-
RE: Who's your electricity provider and what's your tariff?
@downfield Thats a decent rate, I’m shocked they hadn...
By Papahuhu , 2 days ago
-
RE: Adventures in heat loss calculations
@toodles thanks! So as suspected, around a doubling of ...
By SusannaSaunders , 2 days ago
SPONSORS
