You'd need an accumulator, pumping the mains at a rate above 12 litres per minute is illegal. 3 rain head showers at a time? Without having seen the spec of your rain head, I'd be allowing 25l/min each. That's 75l/min draw for three, and up to 100 l/min if you've got all four running at the same time. That's before you even start to take account of any appliances in the kitchen, like the dishwasher, running at the same time. You'll never get 75l/min out of your main. If you get 30l/min I'd be surprised.
Hot water upgrade
- Thread starter Ron_Miles
- Start date
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The kits are not available now. Iirc of was a brief moment of madness on the part of Poxyton.
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That depends on how big the accumulator is....
I would always recommend a tank and booster pump rather than a ( very large ) accumulator.
However its a complete folly to buy unventeds when no one has bothered to measure the dynamic flow rate which we think is going to preclude direct mains supply.
Assume 100% occupation when planning hot water delivery. Rain showers will not be a sensible option.
For a domestic environment a good rule of thumb is stored water at 50 li plus 50 li per person. But that's only the volume to store!
You then need to have an adequate flow and pressure. All unventeds should normally be supplied with a MINIMUM of 22 mm pipe!
Tony
However its a complete folly to buy unventeds when no one has bothered to measure the dynamic flow rate which we think is going to preclude direct mains supply.
Assume 100% occupation when planning hot water delivery. Rain showers will not be a sensible option.
For a domestic environment a good rule of thumb is stored water at 50 li plus 50 li per person. But that's only the volume to store!
You then need to have an adequate flow and pressure. All unventeds should normally be supplied with a MINIMUM of 22 mm pipe!
Tony
Hi Tony,
I understand that 22mm is preferable but we have no option, there is no 22mm available to the property. When we took over even the gas meter was of a domestic size, it took 3 years to convince the gas supplier that a larger meter was needed, just with the old potterton connected the pressure was inadequate and had been condemned by the engineer at the annual safety check.
So we have to find a way around the 15mm dilemma.
I understand that 22mm is preferable but we have no option, there is no 22mm available to the property. When we took over even the gas meter was of a domestic size, it took 3 years to convince the gas supplier that a larger meter was needed, just with the old potterton connected the pressure was inadequate and had been condemned by the engineer at the annual safety check.
So we have to find a way around the 15mm dilemma.
nope, still available, is a bit pricey though
http://gasboilerspareparts.com/pott...arts/potterton-overheat-stat-kit-cf-60-907411
Looks like the kit is still available??
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Is there some reason why you must have unvented cylinder(s)?
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