By knowing what schit does, and what it's called.
You appear to know neither. Call a professional.
You appear to know neither. Call a professional.
Unvented pressurized boiler
- Thread starter WAK1
- Start date
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Oh dear ... I'll get me coat .... 
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D
Doggit
Sorry WAK, but a lot of guys on here have a warped sense of humour, and you just played into their hands.
You've said there are 16 rads, but obviously 16 rads required to heat Buckingham palace, would be a lot larger than 16 for a small semi. A good plumber will take room measurements, and the construction of the building, number of outside walls etc to determine the number of BTUs required to heat each room. Add in capacity for a Hot water tank, and you then get the total capacity of the boiler required, add this to the cost of the rads and the tank, then work out the labour required to install the whole system (about a week or so) and you've then got a rough (very rough) idea of what they should be charging.
Then of course, you get the question of do you want a combi (immediate hot water, and no hot water tank needed) or a system boiler that will heat a hot water tank, but will have to be on every day of the year to heat the hot water.
There are online calculators that will allow you put in each rooms details, and then give you the total heating capacity required.
As always, get as many quotes as possible, and then start to whittle out the oddballs.
You've said there are 16 rads, but obviously 16 rads required to heat Buckingham palace, would be a lot larger than 16 for a small semi. A good plumber will take room measurements, and the construction of the building, number of outside walls etc to determine the number of BTUs required to heat each room. Add in capacity for a Hot water tank, and you then get the total capacity of the boiler required, add this to the cost of the rads and the tank, then work out the labour required to install the whole system (about a week or so) and you've then got a rough (very rough) idea of what they should be charging.
Then of course, you get the question of do you want a combi (immediate hot water, and no hot water tank needed) or a system boiler that will heat a hot water tank, but will have to be on every day of the year to heat the hot water.
There are online calculators that will allow you put in each rooms details, and then give you the total heating capacity required.
As always, get as many quotes as possible, and then start to whittle out the oddballs.
You haven't said what size radiators are being supplied, but in any case that's totally irrelevant to the size of cylinder required as they aren't connected to it. Radiators are connected to your boiler to heat your house. The cylinder is also connected to your boiler, to heat the water that comes from your taps. The two things are entirely independent. You size your cylinder for your hot water requirement, not according to how many radiators you have
1400/1200 by what?
300?
400?
500?
600?
700?
Heatloss?
Mains pressure?
Supply pipe size?
Occupancy?
300?
400?
500?
600?
700?
Heatloss?
Mains pressure?
Supply pipe size?
Occupancy?
D
Doggit
Using 1400 and 1200 rads sounds a bit simplistic; that would make all the rooms about the same size, with the bigger rads for the outside rooms, and a damn big toilet. Where did you get the rad sizes from.
Both megaflow and dimplex cylinders are fine, but what is the capacity that's been recommended, and what boilers have been suggested - if any yet.
Both megaflow and dimplex cylinders are fine, but what is the capacity that's been recommended, and what boilers have been suggested - if any yet.
Sorry thereally are 2 bathrooms and 2 ensuites and youre absolutely right they aren't 1200s (bedrooms). They are 400-500 wide x 600h towel rads.
Been told a 38k BTU vaillant boiler?
The issue is one engineer said that all I need a combi whilst the second chap states I need to have an unvented system so I don't lose pressure. That's why I'm somewhat confused as to who is correct?
Been told a 38k BTU vaillant boiler?
The issue is one engineer said that all I need a combi whilst the second chap states I need to have an unvented system so I don't lose pressure. That's why I'm somewhat confused as to who is correct?
D
Doggit
God WAK, getting information out of you, is like getting blood out of a stone. Are they single rads, or doubles.
You've got 2 bathrooms, and 2 ensuites, and 5 people in the property; this is definitely not the setup for a combi boiler. But I suspect that the unvented cylinder has been understated as well. Doing a quick calculation, for a 38Kw boiler means that it's got just enough capacity for 18 double rads of 600x1400, so nothing much spare for the HW cylinder.
Did they give you a list of the room capacities, the rad sizes for each room, or just an overall quotation.
You need to go online, and find a CH calculator, so that we know what the total heating capacity of the house is. THEN we can advise you a bit more clearly.
You've got 2 bathrooms, and 2 ensuites, and 5 people in the property; this is definitely not the setup for a combi boiler. But I suspect that the unvented cylinder has been understated as well. Doing a quick calculation, for a 38Kw boiler means that it's got just enough capacity for 18 double rads of 600x1400, so nothing much spare for the HW cylinder.
Did they give you a list of the room capacities, the rad sizes for each room, or just an overall quotation.
You need to go online, and find a CH calculator, so that we know what the total heating capacity of the house is. THEN we can advise you a bit more clearly.
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