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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).

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  1. 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...
  2. 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...
  3. R

    Reconfiguring our heating zones and questions.

    We currently have the ground floor wet UFH and upstairs rads running from an unvented condensing boiler. Any advice/experience on the following please:- The 1st-floor and 2nd-floor landing will retain radiators but they will be added to the underfloor manifold as a single zone as it will...
  4. jcsawyer

    H37XL and Greenstar 12i - Can't get the heating zones to work!

    Hey folks! I have been trying to get my heating up and running properly but I have had some trouble. I bought a new house this year and I have only just got to the point where I'd like to use the heating a bit. The house has two honeywell thermostats (Picture attached) one upstairs one...
  5. J

    Diagonal Heating Zones!!

    Hope someone can help. I have dual zone heating in my new build. I have a TPOne-M downstairs and a TPOne-B in the master bedroom upstairs. When I turn on the heating using the downstairs TPOne-M it heats up half of the ground floor, kitchen/diner, hallway and then 2 of the bedrooms upstairs...
  6. M

    Wiring centre for 1UHF and 2Rad zones

    Hoping someone knows a wiring centre that fits this requirement. I have 1 UFH zone (3 circuits) and 2 Radiator zones. Was looking at the Heatmiser UH4 wiring centre schematic, it shows that I can only use zone-4 for a single radiator zone. By selecting the dip switch to not engage the UFH...
  7. G

    How to fully TRV'd an S PLAN CH/HW system

    S Plan CH, unvented, system boiler, hot water plus 2 additiional zones ( zone 1 (landing, bedrooms and bathrom), zone 2 ( downstaris livig areas) I am thinking of 1. removing the automatic by pass 2. adding TRV's to all rads using apple home kit /cloud connected. 3. rewiring the pump to the...
  8. H

    Multi Zone Convert to Single Zone

    I have a new build and has 2 separate zones. One thermostat in main bedroom, one in living room. Main bedroom thermostat controls all bedrooms and bathrooms, living room thermostat controls all downstairs and the upstairs landing. Rooms with thermostats have no TRVs as expected, and all other...
  9. J

    UFH zones not heating up

    Hi, I'm a complete novice to UFH so excuse my ignorance! I've just had underfloor heating installed and an area of the ground floor is not heating up. The thermostat is set to 21 but it isn't getting past 20, and that's due to heat from other zones within a large open plan ground floor. The...
  10. L

    Mismatched zones

    Bit of advice really, although I suspect theres not a great deal I can do about it. We have 2 zones, 1 that covers most the house radiators the other zones covers the big radiator in the loft conversion. The 2nd zone I think was needed for building control. Its a new oil boiler. The issue is...
  11. S

    Air to water heat pump with ufh, how many zones?

    Hi, For a small house (100m2) with and air to water heat pump and underfloor heating, how many thermostatically controlled heating zones would you recommend? There are 3 no. bedrooms, a bathroom, hall, sitting room and kitchen/dining room. The house will be rented out so providing a zone for...
  12. A

    Lazy Water - Zones Not Working Help

    Hi Guys, Appreciate any help I can get. We have an old house which was totally renovated & upgraded 15 years ago. There is a control panel in the utility room which controls the heating/water. It has 3 buttons: Zone 1) Ground Floor - underfloor heating with 3 individual thermostats (no idea...
  13. S

    Smart thermostats and timers in multiple zones

    Hi guys, Hoping I can get some input on a subject related to an extension I am currently having done. My set up is that I have central heating in the majority of the house but as part of my ground floor extension, I am having a water pipe underfloor heating system fitted. I have a megaflow...
  14. S

    What part of a dwelling counts as usable? In terms of heating zones.

    What part of a dwelling counts as usable? In terms of heating zones.
  15. K

    2 port valve to seperate radiators from ufh zones

    Apologies if something like this already been covered. We have new underfloor heating and new radiators upstairs. Problem is the company who fitted the boiler didn't fit a valve to isolate the upstairs radiators, so I fear when we turn on the underfloor heating it will basically heat upstairs...
  16. M

    Central heating zones

    Hi, any help/advice would be much appreciated. I live in a new build house (well 5 years this year) I noticed about 2 years that when I turned the heating on with the downstairs thermostat the main bedroom and en-suite heating would come on. With the upstairs thermostat the downstairs heating...
  17. P

    Viessmann multiple zones

    I know that through opentherm thermostats it is possible to control Vitodense 100-w DHW. But in case you use a simple thermostat there is no way to turn it off remotely. In case of having multiple zones I can't find a way to control dhw since only one opentherm thermostat can be connected. Is...
  18. S

    Split system single Ufh/Ch zone to two zones

    Any advice on the following: I have Worcester 35 combi, joule 210 unvented cyclinder, radiator central heating and polypipe UFH. 3 valves to control UFH, CH and hotwater. I have Honeywell programmer with Tado extension connected to the programmer. The Tado thermostat is in the room with...
  19. R

    Wiring problem 2 zones pumps + salus it500

    Hello! Please help me! I have a thermostat salus IT 500 and it300, Ariston Genus One 35kw and 2 pumps for 2 heating zones. What I want: to independent control each zone, floor no1 and no2, with the pumps. When the temperature that I seted up reaches, the thermostat to command a pump to close the...
  20. M

    smart thermostats for multiple zones?

    hi, I have 4 small bedsits, the heating (radiators) for all 4 is by a single Ideal Vogue c40 Gen2 boiler, I'm wanting to install a seperate smart thermostat in each of the 4 bedsits and ideally 1 in the communal area (5 thermostats in total), does anyone know of a system that will support this...
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