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A hardiness zone is a geographic area defined as having a certain average 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. A plant may be described as "hardy to zone 10": this means that the plant can withstand a minimum temperature of 30 to 40 °F (−1.1 to 4.4 °C).
Unless otherwise specified, in American contexts "hardiness zone" or simply "zone" usually refers to the USDA scale. However, some confusion can exist in discussing buildings and HVAC, where "climate zone" can refer to the International Energy Conservation Code zones, where Zone 1 is warm and Zone 8 is cold.
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).

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  1. Dan

    Checkout the new Plumbing Zone forum

    Thought I'd attempt to outrank another forum. But I'm not sure my skills are there yet 🤔 😕 😅 Plumbing Zone forum. And contractor talk and electrician talk are other ones of theirs. Will collate some stats on them.
    • Dan
    • Thread
    • forum new plumbing zone
    • Replies: 0
    • Forum: Plumbing Zone
  2. C

    3 zone valve question

    I have a CH circuit on a 2 way zone valve. It’s a long circuit with 15 rads on it but rather than shutting down the last 5 rads in the circuit when not in use which is 90% of the time, can I put a 3 zone valve on the flow after the tenth rad and divert to a new T piece on the return to...
  3. J

    One zone will not heat up.

    Afternoon Fellas If anyone has time to help with this snag it'd be much appreciated. We have a wet-floor system controlled by John Guest UH3 and rather dated Heatmiser DT thermostats. One of the upstairs zones is combined for the bedroom/dressing room. So that's 2 rooms, 2 manifolds, but one...
  4. M

    Controls and zone valve

    Is there anyway of testing electrically with a multimeter or any other way. Of testing that when you turn a room stat up it is creating a demand and opening the zone valve? Thank you
    • Matt0029
    • Thread
    • controls forum plumbing valve zone zone valve
    • Replies: 7
    • Forum: Plumbing Zone
  5. D

    Wet underfloor heat not coming on in any zone

    We have UFH throughout downstairs. I have had one coil replaced. I have had the thermostats checked that they are linking to the correct actuators, which they are. the cupboard where the UFH system is gets hot when I turn up the thermostats in one or all zones. The boiler is coming on but the...
    • donnas
    • Thread
    • coming forum heat plumbing underfloor wet zone
    • Replies: 8
    • Forum: Plumbing Zone
  6. W

    Can I have single zone central heating when pipe installed for 2 zone?

    A bit of clarification - I have extended a 3 bedroom semi detached and at the time central heating pipes were going in I told the plumber could I have 2 zones - one for bedrooms upstairs and another for the living areas downstairs. Now the plastering has been finished and I am costing the combi...
    • waynetr
    • Thread
    • central central heating central heating system engineer forum heating installed pipe pipework plumbing single zone zones
    • Replies: 0
    • Forum: Plumbing Zone
  7. H

    Zone Problems with Boiler

    I have an older gas boiler HW heating system with a taco circulator pump for each zone that worked fine last season. When turning it on for the 1st time this season I found a problem with the boiler not running on one of the zones. If I turn on the heat to zone 1 I hear the system...
  8. G

    Control System for 3 zone Central heating?

    HI folks, this post is a follow up to my post relating to my single pipe heating system. In summary, I have a house built in 1980 (I bought it 2 years ago) that had a single pipe heating system but over the years there have been some changes made to the system that meant it didn't work. I have...
    • George Kaplan
    • Thread
    • central central heating control forum heating plumbing system zone
    • Replies: 8
    • Forum: Plumbing Zone
  9. Inverness

    How is a 2 zone heating system suppose to be piped

    Hi. A new house regulation for a 2 zone heating system because it's bigger that 150sqm. I'm I right in saying zone 1 should be all of the downstairs radiators and zone 2 all of the upstairs radiators ? I have thermostat room programmer down the stairs and another one upstairs. I think the two...
    • Inverness
    • Thread
    • central heating system forum heating heating system piped plumbing system zone
    • Replies: 10
    • Forum: Plumbing Zone
  10. I

    Zone valve Flow Direction may be incorrect - Advice required

    Hi, first time plumber and poster here. I've installed two new zone valves and replicated the direction inwhich the original valves were installed. I'm really confused now as I think the originals may have been installed the wrong way round. The Grundfos pumps' arrow is pointing down whereas my...
    • imguessing
    • Thread
    • advice direction flow forum incorrect plumbing required valve zone zone valve
    • Replies: 1
    • Forum: Plumbing Zone
  11. T

    Controls advice - Multi zone

    Any recommendations guys? I’m looking for a central/single controller which will be located (in boiler room) away from the underfloor heated rooms. There will be six or so areas which will need to be separately temperature controlled. Each area will have a temperature sensor wired back to the...
    • Timmy D
    • Thread
    • advice controls forum multi plumbing zone
    • Replies: 7
    • Forum: Plumbing Zone
  12. samwardill

    Honeywell Evohome with 2 zone heating

    Is there any advice on using Honeywell Evohome with 2 zone heating. Honeywell support are pretty useless and give conflicting advice. They suggested I ask my installer (but my installer suggested I ask Honeywell). I found a support article on the Honeywell Resideo website by Googling...
    • samwardill
    • Thread
    • central heating system evohome forum heating honeywell plumbing zone
    • Replies: 14
    • Forum: Plumbing Zone
  13. F

    Broken zone valve for downstairs heating?

    Hi all, Hoping to check if I have a genuine fault, or something I've overlooked. I've just moved into a my first house with a conventional boiler and hot water tank. The heating system has two heating zones (upstairs / downstair). Currently with both thermostats up high and the heating zones...
    • Flemingjp
    • Thread
    • broken downstairs forum heating plumbing valve zone zone valve
    • Replies: 5
    • Forum: Plumbing Zone
  14. J

    2 way 2 zone valve question.

    Hi I have a honeywell programmer which does 10 min cycles but with the zone valve fitted it is closed during a 4.5 min long pump only cycle. Is there a way to stop this and only close when pump stops. It is open during heat and pump part but you can gradually loose a warm rad with it not...
    • Jhonesy
    • Thread
    • 2 port forum plumbing question valve zone zone valve
    • Replies: 3
    • Forum: Plumbing Zone
  15. N

    Dual zone central heating query

    Hopefully a quick question: I have bought a new house and had a few issues with the CH system (they connected the valves for the two zones to the wrong thermostats which has now been fixed) but have now come across something that doesn't make sense to me. I have a downstairs cloakroom (toilet)...
    • Neil Atkins
    • Thread
    • central central heating central heating system dual dual zone forum heating plumbing query zone
    • Replies: 2
    • Forum: Plumbing Zone
  16. B

    2 Zone Wet UFH System room temp low.

    Hi, I am using mu UFH for the first time and it doesn’t seems to get the whole floor warm enough let alone the room. (Intalled May 2022). First use this week. It is installed as per manufacturer’s details but seems to have to much temperature drop across the loop approx 25degc. Flow rate...
  17. R

    Hive multi-zone wireless heating

    I want to buy a Hive wireless multi-zone system I have a dual-zone wireless system. A combi boiler plus a hot water cylinder. What do I need to buy from Hive? What's the cost to install? Ray
    • Raymondo
    • Thread
    • central heating system forum heating hive plumbing wireless zone
    • Replies: 0
    • Forum: Plumbing Zone
  18. A

    Underfloor heating - zone not heating properly

    We moved into our flat over the summer and haven’t really used the heating much and no guides or anything we left so really don’t understand how it works! It is a wet underfloor system, with 5 zones controlled via a Loxone app (smart home system). Currently the room furthest away from the...
    • Annabp
    • Thread
    • central heating system forum heating not heating plumbing properly underfloor underfloor heating zone
    • Replies: 1
    • Forum: Plumbing Zone
  19. D

    UFH zones come on at random - strange or normal?

    Hi. This UFH system is in my mil's bungalow purchased earlier this year. It has 9 zones, is run from a WB 37CDi combi, and uses Wavin actuators with a wall stat in each zoned room. It all appears to work just as it should. A few weeks back, tho', one of the two bedrooms warmed up excessively...
    • DevsAd
    • Thread
    • forum normal plumbing random strange ufh zone zones
    • Replies: 7
    • Forum: Plumbing Zone
  20. A

    Zone valve and gas bills

    Hi all I have been noticing that my gas bills have been excessively high even in the current climate …I did a little investigating and found my unvented heating system only has one 2 port zone valve controlling the hot water. My question is could this be what is causing the high bills as there...
    • Andymav
    • Thread
    • bills forum gas plumbing valve zone zone valve
    • Replies: 6
    • Forum: Plumbing Zone
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