Residential Tenancies (Healthy Homes Standards) Regulations 2019

Schedule 2 Heating capacity of qualifying heaters in main living room

r 10

1 Interpretation

(1)

In this schedule,—

area, in relation to a building element of a living room, means the area of the face of the building element internal to the living room (but see also subclause (2))

conditioned space means a space within a building that is designed or built with the intention that it may be directly or indirectly heated or cooled for occupant comfort

construction R-value has the same meaning as in NZS 4218:2009 (but see also subclause (2))

thermal envelope, in relation to a building, means the building elements that together enclose all of the conditioned spaces within the building (being so much of the roof (if any) and all of the walls, ceilings, floors, windows, skylights, and doors that separate conditioned spaces from spaces within the building that are not conditioned spaces or from spaces outside the building)

window includes any transparent or translucent area in a building’s thermal envelope other than a skylight.

(2)

For the purpose of determining its area or construction R-value, a window, skylight, or door is taken to include its frame and associated joinery.

2 Required heating capacity

The required heating capacity for a living room is to be calculated using the following formula:

h = [t + v + (f × 40) ] ÷ 1000

where—

h

is the required heating capacity for the living room (kW)

t

is the transmission heat loss of the living room (W) calculated under clause 3

v

is the ventilation heat loss of the living room (W) calculated under clause 4

f

is the area of the floor of the living room (m2).

3 Transmission heat loss

(1)

The transmission heat loss of a living room is to be calculated using the following formula:

t = [ d + (e × g) ] × (b − c)

where—

t

is the transmission heat loss of the living room (W)

d

is the transmission heat loss in respect of the living room’s building elements that are part of the tenancy building’s thermal envelope (W), calculated under subclause (2)

e

is the transmission heat loss in respect of the building elements that form the boundaries of the living room but are not part of the building’s thermal envelope (W), calculated under subclause (3)

g

is the temperature adjustment factor for building elements that are not part of the tenancy building’s thermal envelope, being 0.5

b

is the required internal temperature, being 18°C

c

is the assumed external temperature for the premises as set out in clause 5.

(2)

The value of d is to be calculated using the following formula:

Equation to calculate the value of d

where—

d

is the transmission heat loss in respect of the living room’s building elements that are part of the building’s thermal envelope (W)

Aj

is the area of ceiling j (m2)

Rj

is the construction R-value of ceiling j (°Cm2/W)

j

is the numbering index for all of the living room’s ceilings that are part of the building’s thermal envelope

Ak

is the area of wall k (m2)

Rk

is the construction R-value of wall k (°Cm2/W)

k

is the numbering index for all of the living room’s walls that are part of the building’s thermal envelope

Am

is the area of floor m (m2)

Rm

is the construction R-value of floor m (°Cm2/W)

m

is the numbering index for all of the living room’s floors that are part of the building’s thermal envelope

An

is the area of window n (m2)

Rn

is the construction R-value of window n (°Cm2/W)

n

is the numbering index for all of the living room’s external windows

Ap

is the area of skylight p (m2)

Rp

is the construction R-value of skylight p (°Cm2/W)

p

is the numbering index for all of the living room’s skylights.

(3)

The value of e is to be calculated using the following formula:

Equation to calcuate the value of e

where—

e

is the transmission heat loss in respect of the building elements that form the boundaries of the living room but are not part of the building’s thermal envelope (W)

Aq

is the area of ceiling q (m2)

Rq

is the construction R-value of ceiling q (°Cm2/W)

q

is the numbering index for all of the living room’s ceilings that are part of the boundary of the living room but are not part of the building’s thermal envelope

As

is the area of wall s (m2)

Rs

is the construction R-value of wall s (°Cm2/W)

s

is the numbering index for all the living room’s walls that are part of the boundary of the living room but are not part of the building’s thermal envelope

Au

is the area of floor area u (m2)

Ru

is the construction R-value of floor area u (°Cm2/W)

u

is the numbering index for all of the living room’s floors that are part of the boundary of the living room but are not part of the building’s thermal envelope.

(4)

For the purposes of subclauses (2) and (3), if a ceiling, wall, or floor consists of 2 or more areas that have different construction R-values, each of those areas is taken to be a separate ceiling, wall, or floor.

4 Ventilation heat loss

The ventilation heat loss of a living room is to be calculated using the following formula:

v = w × y × z × (b − c)

where—

v

is the ventilation heat loss of the living room (W)

w

is the internal volume of the living room (m3)

y

is the assumed air change rate of the living room, being 1.0

z

is the assumed value for the density of air multiplied by the specific heat of air, being 0.34 Wh/m3K

b

is the required internal temperature, being 18°C

c

is the assumed external temperature for the premises as set out in clause 5.

5 Assumed external temperature

The assumed external temperature for residential premises is the temperature set out in the following table for the territorial authority in whose district the premises are located.

Territorial authorityAssumed external temperature (°C)
Ashburton District Council−5
Auckland Council1
Buller District Council−3
Carterton District Council−4
Central Hawke’s Bay District Council−3
Central Otago District Council−8
Chatham Islands Council−1
Christchurch City Council−4
Clutha District Council−4
Dunedin City Council−4
Far North District Council2
Gisborne District Council0
Gore District Council−4
Grey District Council−2
Hamilton City Council−3
Hastings District Council−2
Hauraki District Council−2
Horowhenua District Council−3
Hurunui District Council−5
Hutt City Council−1
Invercargill City Council−4
Kaikōura District Council1
Kaipara District Council1
Kapiti Coast District Council−3
Kawerau District Council−2
Mackenzie District Council−10
Manawatu District Council−2
Marlborough District Council−3
Masterton District Council−4
Matamata–Piako District Council−3
Napier City Council−2
Nelson City Council−3
New Plymouth District Council0
Ōpōtiki District Council−2
Otorohanga District Council−3
Palmerston North City Council−3
Porirua City Council0
Queenstown–Lakes District Council−6
Rangitikei District Council−4
Rotorua District Council−3
Ruapehu District Council−5
Selwyn District Council−4
South Taranaki District Council−1
South Waikato District Council−3
South Wairarapa District Council−4
Southland District Council−6
Stratford District Council−2
Tararua District Council−3
Tasman District Council−4
Taupō District Council−5
Tauranga City Council0
Thames–Coromandel District Council−1
Timaru District Council−5
Upper Hutt City Council−3
Waikato District Council−2
Waimakariri District Council−4
Waimate District Council−5
Waipa District Council−3
Wairoa District Council0
Waitaki District Council−5
Waitomo District Council−3
Wellington City Council2
Western Bay of Plenty District Council−1
Westland District Council−2
Whakatane District Council−2
Whanganui District Council−1
Whangarei District Council2

Michael Webster,
Clerk of the Executive Council.