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Combi, Unvented,or Conventional system.... Please help
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<blockquote data-quote="ProDave" data-source="post: 241861" data-attributes="member: 6969"><p>Just my two pence worth:</p><p></p><p>Combi boilers are rubbish, unless you get a really large one. Okay for a shower, but painfully slooooow to draw a bath of water.</p><p></p><p>I have a mains pressure unvented hot water tank and it's great. I can fill a bath in a couple of minutes, and have a shower that will knock you into next week. But we have decent water pressure.</p><p></p><p>Unvented tanks have maintenance responsibilities and obligations, and are supposed to be installed by a plumber with his unvented ticket, but it appears to be like gas, if you are competent, you can DIY your own install (I did)</p><p></p><p>There is a third option, a "heat store" tank. That's a bit like a hot water tank inside out. The boiler directly heats the water in the tank, and the water in the tank directly heats your radiators. The tank water is fed from a header tank, so it's a vented system so no maintenance issues and you don't need any special qualifications to install it.</p><p></p><p>But here's the clever bit, the hot water is "instantly" heated by passing through a heat exchange coil in the top of the tank. So from the plumbing point of view it's no different to any mains pressure water piping and no need for expansion vessels and relief valves. But you get hot water at mains pressure.</p><p></p><p>If your pressure is variable or poor, fit a thermostatic mixer shower with a pump, and you will get a truly decent shower.</p><p></p><p>I wish I had known about heat store tanks when I built this house, I would have installed that in preference to the unvented tank I have.</p></blockquote><p></p>
[QUOTE="ProDave, post: 241861, member: 6969"] Just my two pence worth: Combi boilers are rubbish, unless you get a really large one. Okay for a shower, but painfully slooooow to draw a bath of water. I have a mains pressure unvented hot water tank and it's great. I can fill a bath in a couple of minutes, and have a shower that will knock you into next week. But we have decent water pressure. Unvented tanks have maintenance responsibilities and obligations, and are supposed to be installed by a plumber with his unvented ticket, but it appears to be like gas, if you are competent, you can DIY your own install (I did) There is a third option, a "heat store" tank. That's a bit like a hot water tank inside out. The boiler directly heats the water in the tank, and the water in the tank directly heats your radiators. The tank water is fed from a header tank, so it's a vented system so no maintenance issues and you don't need any special qualifications to install it. But here's the clever bit, the hot water is "instantly" heated by passing through a heat exchange coil in the top of the tank. So from the plumbing point of view it's no different to any mains pressure water piping and no need for expansion vessels and relief valves. But you get hot water at mains pressure. If your pressure is variable or poor, fit a thermostatic mixer shower with a pump, and you will get a truly decent shower. I wish I had known about heat store tanks when I built this house, I would have installed that in preference to the unvented tank I have. [/QUOTE]
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