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zones
A hardiness zone is a geographic area defined as having a certain range of annual minimum temperature, a factor relevant to the survival of many plants. In some systems other statistics are included in the calculations. The original and most widely used system, developed by the United States Department of Agriculture (USDA) as a rough guide for landscaping and gardening, defines 13 zones by long-term average annual extreme minimum temperatures. It has been adapted by and to other countries (such as Canada) in various forms.
Unless otherwise specified, in American contexts "hardiness zone" or simply "zone" usually refers to the USDA scale. For example, a plant may be described as "hardy to zone 10": this means that the plant can withstand a minimum temperature of 30 °F (−1.1 °C) to 40 °F (4.4 °C).
Other hardiness rating schemes have been developed as well, such as the UK Royal Horticultural Society and US Sunset Western Garden Book systems. A heat zone (see below) is instead defined by annual high temperatures; the American Horticultural Society (AHS) heat zones use the average number of days per year when the temperature exceeds 30 °C (86 °F).
Hi, I am new to the forum and have a question. With recessed spotlights is it necessary to fit a different type above the shower cubicle? Do most people fit all the same light throughout the room or is it normal for the one above the shower to be a "shower light" which differs in appearance...
OZZIE
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zones
Am fed up lately quoting jobs for bathroom rip-outs and upgrades, where my 'competitors' have neglected (ooops what an oversight or cost cutting trick) to advise / price in, vent fan or light fitting replacements to comply with latest zoning regs. So our quotes are always higher. Anyone else...
When bleeding the radiators it is recomended to turn the boiler off to prevent air being drawn in (can't see how if the system is at 1.5 bar).
If the boiler and zones are off then would it bleed ok or do I have to ensure that the zone valve is on whilst the boiler is off?
plumbinguser
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zones
Hi
I have been reading the forums and believe that I understand how to balance a single system.
I have two zones on the central heating, one for downstairs and one for upstairs. I have these coming on together in the morning but after that they are timed for different times.
The question...
plumbinguser
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Hi, ive recently had underfloor heating installed and two of the zones are governed by a digital programmable thermostat, a Polypipe PB PZP. I have tried to turn the heating down from the makers pre set temp (21 degrees) but the temp still remains high and the unit constanly click (which...
Raymundi
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zones
Hi,
I hope someone can advise please......
My mother had new central heating 2 months ago from British Gas. I couple of weeks ago, she had the house rewired. The electrican (who's a jack of all trades) pointed out the pipes beneath the floorboards were either up flush against the top of the...
fitzsy
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I have a 4 storey farmhouse where the main house is heated from a oilfired boiler in the basement. Main pump is on the first floor. Additional pump has been added in the basement with second separte flow tapping from boiler to give two separate zones. All works well when all on together. Can I...
Graeme_Wright
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First off just want to say i'm new here but so fr have been enjoying just browsing through the forum. Anyway it's suppose to be something really simple but for some reason i'm having trouble with it. How exactly do you find the x zone (or dimension) for a fitting. I was told that you just simply...
pudzamoisey
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zones
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