c/kWh
$/kLusage charge on your water bill
per week
Capacity
12 place
Built-in
Energy rating
3
Annual electricity use
280 kWh
Label: 281 kWh ยท 0.77 kWh per cycle
Estimated running cost
$104 / year
$92 electricity + $11 water ยท $1,037 over 10 years
Water per cycle
14.7 L ยท Normal ECO programme

11% more electricity than the median of 11 comparable 10โ€“12 place built-in dishwasher registrations (253 kWh a year on the label basis). It uses less than 18% of them. At your rates that is about $9 a year more than the median, $92 over 10 years.

How efficient is it for its size?

kWh per year. Bar: the middle 80% of 11 comparable 10โ€“12 place built-in dishwasher registrations. Dot: this model (above the median). Hover or tab to a mark for its value.

Cohort: every currently registered 10โ€“12 place built-in dishwasher sold in New Zealand, counted once per registration, on the label usage basis.

Dishwashers that use less electricity

Same type and size group, at least 3% lower annual kWh on the label basis.

ModelStarsEst. cost / yrCompare
Bosch SPU6IMS01A11 place settings205 kWh/yr3.5$68
Bellissimo HNBD12FI12 place settings253 kWh/yr3$83
Artusi ADW5001W12 place settings256 kWh/yr3$84
Artusi ADW5001X12 place settings256 kWh/yr3$84
Kleenmaid DW6020XB12 place settings265 kWh/yr3$87

kWh and cost on the label usage basis; the product page adjusts to your usage.

Dishwashers similar to the Smeg STH903

ModelStarsEst. cost / yrCompare
Artusi ADW5001W12 place settings256 kWh/yr3$84
Fotile BD3B-G3-Y12 place settings282 kWh/yr3$93
Artusi ADW5001X12 place settings256 kWh/yr3$84
Kleenmaid DW6020XB12 place settings265 kWh/yr3$87
Stirling STR-DWSS12MW12 place settings282 kWh/yr3$93
Bellissimo HNBD12FI12 place settings253 kWh/yr3$83
Stirling STR-DWSS12M12 place settings282 kWh/yr3$93
Bosch SPU6IMS01A11 place settings205 kWh/yr3.5$68

kWh and cost on the label usage basis; the product page adjusts to your usage.

Compare STH903 with another dishwasher

Smeg STH903 specifications

Type
Built-in
Place settings
12
Water per cycle (labelled programme)
14.7 L
Programme tested
Normal ECO
Programme time
178 min
Water connection
Single
Water softener
No
Delay start
Yes
Standby power
0.06 W
Dimensions (Wร—Hร—D)
860 ร— 580 ร— 600 mm
Annual energy (label)
281 kWh
Star rating index
3.01
Country of manufacture
Italy

1 model numbers on 1 other registration. Variants registered separately can carry different star ratings and energy figures; check the registration number on the label.

ModelRegistrationStarskWh / yr
STH903ZDW00273279

New Zealand E3 registration details

Registration number
ADW0871
GEMS registration id
142159
Status
approved, available (self-reported)
Registration expires
18 October 2026
Registered for sale in
Australia, Fiji, New Zealand
Family
โ€“
Regulatory standard
Greenhouse and Energy Minimum Standards (Dishwashers) Determination 2024
Test standard
AS/NZS 2007.1:2005

Source: E3 programme registration data (EECA, New Zealand) (trans-Tasman E3 registration data published by DCCEEW on data.gov.au, CC BY 3.0 AU). Dataset published 20 September 2026; last checked 20 September 2026. How the derived figures are calculated.