Gaf Posted Friday at 15:02 Share Posted Friday at 15:02 We plan to get the water treated, however a neighbour with a well likely running off the same water table has had two DHW tanks go kaput in the past 10 years. Supposedly no particular issue can be identified as to the cause of the two going kaput. Both were under warranty so replaced without issue but we still want to consider what our DHW might need to be. We're in a hard water area (you'd want to see the limescale on another neighbours kettle 🤣). Neighbour said theirs was 'marine grade', but searching here I've seen this is a bit of a marketing term. It seems it's about the grade of steel that is the most important aspect? DHW will be connected to A2W heat pump and my understanding is it will be unvented. No solar. I've seen Joule and Dejong mentioned, not sure if these are well regarded makes? Link to comment Share on other sites More sharing options...
JohnMo Posted Friday at 15:24 Share Posted Friday at 15:24 We a hard water well for drinking water. We use a BWT Combi care upstream of cylinder. Link to comment Share on other sites More sharing options...
JohnMo Posted Friday at 15:27 Share Posted Friday at 15:27 22 minutes ago, Gaf said: marine grade Means nothing really. The issue is not materials but scale being deposited. You could make it out of gold and you would still get deposits killing the coil heat transfer. You need to stop the deposits forming in the first place. Link to comment Share on other sites More sharing options...
Gaf Posted Saturday at 08:03 Author Share Posted Saturday at 08:03 16 hours ago, JohnMo said: Means nothing really. The issue is not materials but scale being deposited. You could make it out of gold and you would still get deposits killing the coil heat transfer. You need to stop the deposits forming in the first place. Perfect, so it’s all about prevention 👍 Link to comment Share on other sites More sharing options...
marshian Posted Saturday at 11:03 Share Posted Saturday at 11:03 19 hours ago, JohnMo said: Means nothing really. The issue is not materials but scale being deposited. You could make it out of gold and you would still get deposits killing the coil heat transfer. You need to stop the deposits forming in the first place. Spot on ^ We live in a stupidly hard water area - kettles last at best 2 years and anything that gets in contact with water has water marks all over it When I replaced my 115 litre copper HW tank in 2011 (old one had been in since house was built in 1982) I drained it down and disconnected it - I could hardly lift the damn thing and it took two of us to carry it down the stairs The local scrap dealer would give me a good price for copper but stipulated that it had to be cut open and any scale removed before he'd weigh it and give me cash for it I could not see the heating coil for all the scale inside!!!!! I've got a picture somewhere of the inside of it!! I fitted a water softener after that and now the glass and tiles in the showers stay super clean and the taps don't fur up Kettles still only last 2 years max but we don't use softened water for cooking or drinking Link to comment Share on other sites More sharing options...
MJNewton Posted Monday at 16:14 Share Posted Monday at 16:14 On 11/01/2025 at 11:03, marshian said: I've got a picture somewhere of the inside of it!! I'd like to see that. I am considering descaling ours in the spring/summer and would like to know what I might be up against! Link to comment Share on other sites More sharing options...
marshian Posted Monday at 18:29 Share Posted Monday at 18:29 2 hours ago, MJNewton said: I'd like to see that. I am considering descaling ours in the spring/summer and would like to know what I might be up against! i couldn’t see the heating coil when I cut the top off once I’d cut the coil connections and pulled it out this was was left inside 1 Link to comment Share on other sites More sharing options...
MJNewton Posted Monday at 19:10 Share Posted Monday at 19:10 Ooh nice. Will be interesting to see what I've got, and whether a 2kg tub of Fernox DS3 will dissolve it! Link to comment Share on other sites More sharing options...
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