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| Electric shower, anything I can do? |
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| soldar:
First you said: --- Quote from: Someone on July 25, 2019, 11:25:15 am ---All the units I'm familiar with do have power control with ratios over 20, even beyond a factor of 30 so based on your choice of numbers they work fine. This is going back 20 years so its nothing new or exclusive, there are multiple suppliers of products which meet those requirements. --- End quote --- Now you contradict that: --- Quote from: Someone on July 26, 2019, 03:22:46 am ---500W is down in the electric power level, most gas systems bottom out at a few kW but since they are all continuous flow models you can have multiple in series/parallel configurations for people with very special requirements for ranges or volumes of water. --- End quote --- I think you may be overestimating your knowledge in this field. --- Quote from: Someone on July 26, 2019, 03:22:46 am ---Not disagreeing with your preferences but you repeated provably false statements as fact, so just correcting your misinformed position that you make so loudly. --- End quote --- There is a bunch of us here having a pleasant exchange and your aggressive and unpleasant attitude just ruins it for me. Other people seem to be able to disagree without being disagreeable. I do not need this and will not be addressing any aggressive posts. I hope whatever is bothering you gets resolved and you can enjoy a good day. And if it is my posts that upset you I recommend using the "ignore poster" list. It works very well for me. Posters that I do not consider worth my time go on that list and it saves me a lot of scrolling. |
| paulca:
Anyway, I have found this discussion interesting. Obviously as I am embarking on an expensive change to my heating system to modernise it I'm a little nervous about picking the wrong approach. While realising the international audience and different climates and different types of system out there, I thought I would ask for opinions on the merits between the options I have. 1. Keep the same basic type of system, ie. a "System boiler" which has the heat exchange coil in the hot tank, ideally with an electric valve to choose between hot water only, heating only or both. 2. Replumb the system to be on-demand hot water only, removing the hot tank entirely. To be honest, having lived with option 2 for nearly 15 years I do really like it. The downside is it removes my ability to later use solar PV water heating. Also the heat fed into the hot tank from solar pv would of course transfer to the radiators when the circ pump is on, it would save money (a little) in space heating too. |
| SteveyG:
--- Quote from: paulca on July 26, 2019, 09:37:03 am ---Anyway, I have found this discussion interesting. Obviously as I am embarking on an expensive change to my heating system to modernise it I'm a little nervous about picking the wrong approach. While realising the international audience and different climates and different types of system out there, I thought I would ask for opinions on the merits between the options I have. 1. Keep the same basic type of system, ie. a "System boiler" which has the heat exchange coil in the hot tank, ideally with an electric valve to choose between hot water only, heating only or both. 2. Replumb the system to be on-demand hot water only, removing the hot tank entirely. To be honest, having lived with option 2 for nearly 15 years I do really like it. The downside is it removes my ability to later use solar PV water heating. Also the heat fed into the hot tank from solar pv would of course transfer to the radiators when the circ pump is on, it would save money (a little) in space heating too. --- End quote --- Personally, I would not choose a system boiler. If you're going down the route of an unvented cylinder then go for a heat-only boiler and keep the rest external - it'll be more maintainable. Have you measured your water supply to even know if a combi boiler is a viable option? |
| soldar:
--- Quote from: paulca on July 26, 2019, 09:37:03 am ---The downside is it removes my ability to later use solar PV water heating. Also the heat fed into the hot tank from solar pv would of course transfer to the radiators when the circ pump is on, it would save money (a little) in space heating too. --- End quote --- What do you mean by "PV"? wouldn't you just use plain solar collectors? PV, photovoltaic, is to generate electricity. Regarding choices, you have to make your own. Nobody knows what suits you better than yourself. As you can see there are plenty of different views and tastes. If you are not entirely sure then do what I try to do which is to do things in a way they can easily be altered later. |
| paulca:
--- Quote from: soldar on July 26, 2019, 09:55:00 am ---What do you mean by "PV"? wouldn't you just use plain solar collectors? PV, photovoltaic, is to generate electricity. Regarding choices, you have to make your own. Nobody knows what suits you better than yourself. As you can see there are plenty of different views and tastes. If you are not entirely sure then do what I try to do which is to do things in a way they can easily be altered later. --- End quote --- Thermal solar doesn't work very well here. Sure it might work in summer, but in winter by the time they have started to warm up the sun is going down. They also require circulation pumps to be maintained and if they fail in summer the panels can burst. In winter if it gets very cold they have to be heated to stop them freezing, depending of course on how much anti-freeze you put in their loop. They require a dual coil hot tank here too. Solar PV -> MPPT Controller -> DC Immersion heater is more efficient here as at noon 1kW of panels will still produce close to 1kW of power, even in the dead of winter when it's -10*C outside. I'm not asking for people to make the decision for me, just looking for opinions and considerations that I may, or may not have considered. |
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