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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#42
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Help protect 3-port valve by switching off hot water last
On Mon, 16 Dec 2019 07:58:54 +0000, The Natural Philosopher
wrote: On 16/12/2019 07:53, MM wrote: On Sun, 15 Dec 2019 22:59:43 +0000, John Rumm wrote: On 15/12/2019 11:34, MM wrote: On Fri, 13 Dec 2019 14:00:44 +0000, John Rumm wrote: On 13/12/2019 09:19, MM wrote: On Thu, 12 Dec 2019 12:02:30 -0800 (PST), wrote: On Thursday, 12 December 2019 18:31:00 UTC, MM wrote: On Thu, 12 Dec 2019 10:11:06 -0800 (PST), tabbypurr wrote: On Thursday, 12 December 2019 09:15:48 UTC, MM wrote: My heating engineer, who is very good and always does a good job, fitted a new 3-port valve in the airing cupboard last week. He replaced the Danfoss with a Honeywell. The Danfoss has lasted 15 years. He explained how these valves work and said that it was always better, if possible, to have the hot water switch off AFTER the heating, because this guarantees less wear on the valve due to the way the valve positions itself when the hot water is switched off. Even if one has the central heating on and it is then turned off, it's a good idea to switch on the hot water briefly, even for only 30 seconds, so as to reposition the valve beneficially. MM That ain't right. The 3 position valve's positions are, in this order: HW only (resting position), both on, CH but no HW. So the way to minimise wear is to not turn the HW off at all, jus leave it move between HW and both. But then I'm going to have far more hot water than I know what to do with. One hour with the Wallstar gives me enough water for a hot bath AND the washing-up. MM Once it's hot it stops heating it. Sure -- but only for a while, as the temperature will inevitably fall and the boiler will kick in again. If I've had my bath that day, how can I justify having a copper cylinder full of very hot water until the next day? Seems daft to have piping hot water at 3:00 a.m. at night. With good lagging, relatively little heat will be "lost". However also keep in mind where it is lost to - i.e. it ends up leaking into the house in most cases, where it will simply reduce the amount that needs replenishment from the CH at this time of year ans so is mostly cost neutral. It "leaks" upwards (where all heat leaks...) and upwards is the loft, as the airing cupboard is on the first floor. Sure, do whatever works for you. I only mentioned it since people often get overly concerned about the costs of DHW production, when in reality they are typically dwarfed by the space heating costs. Absolutely. During the summer, when the CH is off, the HW burns a very small amount of oil to get me my tankful of very hot water. The heating oil lasts a very long time. MM My DHW is about £100 a year. In winter CH is £100 a WEEK. You must have either a large house or like it very warm, possibly both. 500 litres lasts me about 10 months usually. However, I *don't* like a very warm house. Some people's houses are unbearably hot. OK, I suppose, if there are infants or old people, but I'm not exactly young myself and I don't like high temperatures. Two years ago, Toulouse in the south of France was awful. 32 deg at 3:00 a.m. It was a relative's house and they don't have air conditioning. MM |
#43
Posted to uk.d-i-y
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Help protect 3-port valve by switching off hot water last
MM wrote:
32 deg at 3:00 a.m. Sounds good to me! -- Roger Hayter |
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