Stiebel Eltron DEL 18 Plus
SunCity Hot Water supplies, installs, services and repairs the Stiebel Eltron DEL 18 Plus — a German-engineered 3-phase electric instantaneous water heater that delivers hot water up to 50°C with no tempering valve required — ideal for apartments and modern homes. Call 1300 728 122.
- German engineered
- Endless hot water on demand
- Ideal for apartments
- New installs & repairs
The Stiebel Eltron DEL 18 Plus
The Stiebel Eltron DEL 18 Plus is a premium 3-phase electric instantaneous (instant) water heater, part of the DEL Plus range that improves on the original DEL. It delivers endless hot water on demand — with a backlit multifunction display, temperature memory, childproofing and a 3-stage ECO mode for best-in-class comfort and efficiency.
Its energy- and water-saving ECO mode can limit the maximum flow rate to hold a constant hot water temperature, even when incoming cold water is low. The DEL Plus delivers hot water up to 50°C in line with AS3498, so no tempering valve is needed.
The DEL Plus range is extremely common in modern high-rise apartments across South-East Queensland. SunCity Hot Water supplies, installs, services and repairs the DEL 18 Plus across the Sunshine Coast, Brisbane, Bribie Island and Gympie.
Why the DEL 18 Plus?
German-engineered instant hot water, built for precision and efficiency.
Made in Germany
German-engineered and manufactured for premium reliability and precision.
Up to 50°C — No Tempering Valve
Delivers hot water not exceeding 50°C in line with AS3498, so no tempering valve is required.
3-Stage ECO Mode
Saves energy and water by holding a constant temperature, even with low inlet temperatures.
3i Technology
Electronically controlled for stable, comfortable hot water delivery.
Temperature Memory Keys
One-touch memory buttons and a backlit multifunction display.
Childproof Anti-Scald
Temperature-limiting function protects against scalding.
Live in a modern apartment? Stiebel Eltron DEL Plus 3-phase electric instant systems are extremely common in high-rise buildings constructed in the last decade. Need a new unit or a repair? Our team knows these systems inside out — see all instant hot water systems.
Technical Specifications
Full specifications for the Stiebel Eltron DEL Plus range.
| Specification | DEL 13 Plus | DEL 18 Plus | DEL 27 Plus |
|---|---|---|---|
| Rated output (415 V) | 14.5 kW | 19.4 kW | 28 kW |
| Rated current (415 V) | 20.2 A | 27 A | 38.9 A |
| Connection | 3/PE | 3/PE | 3/PE |
| Fuse protection | 20 A | 32 A | 40 A |
| Switch-on flow rate | 2.5 L/min | 2.5 L/min | 2.5 L/min |
| Temperature settings | Off, 20–50 °C | Off, 20–50 °C | Off, 20–50 °C |
| Water connection | G 1/2 A | G 1/2 A | G 1/2 A |
| Max. pressure | 1000 kPa | 1000 kPa | 1000 kPa |
| IP rating | IP25 | IP25 | IP25 |
| Dimensions (H×W×D) | 466×225×116 mm | 466×225×116 mm | 466×225×116 mm |
| Weight | 3.2 kg | 3.2 kg | 3.2 kg |
| Approvals | WaterMark / AS3498 | WaterMark / AS3498 | WaterMark / AS3498 |
Specifications from the Stiebel Eltron DEL Plus data sheet. Refer to AS/NZS3500.4 and local requirements for installation. Data may change without notice.
Stiebel Eltron DEL Plus Data Sheet
Full specifications, dimensions & features (PDF).
Comparing models? See the Stiebel Eltron DHE 27 3-Phase Electric Instant System, all instant hot water systems, or the full Stiebel Eltron range.
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Our local technicians are part of the SunCity Brisbane hot water systems and Sunshine Coast hot water systems service network — available for same-day hot water system repairs and replacement across South East Queensland. Call 1300 728 122 for same-day service.
FAQs
Stiebel Eltron DEL 18 Plus — Frequently Asked Questions
What is the Stiebel Eltron DEL 18 Plus?
The DEL 18 Plus is a German-made 3-phase electric instantaneous (instant) water heater. It heats water on demand as it flows through the unit — no storage tank — delivering endless hot water up to 50°C, with a rated output of 19.4kW.
Does the DEL Plus need a tempering valve?
No. The DEL Plus delivers hot water not exceeding 50°C in accordance with AS3498, so a tempering valve is not required. Always refer to AS/NZS3500.4 and local requirements to confirm whether additional delivery-temperature control applies to your install.
What size DEL Plus do I need?
The DEL Plus comes in three sizes — DEL 13 Plus (14.5kW), DEL 18 Plus (19.4kW) and DEL 27 Plus (28kW). The right size depends on your incoming cold water temperature and how many outlets run at once. In Brisbane, the DEL 18 Plus delivers roughly 8 L/min at a comfortable temperature rise. We'll size it for your home.
Is the DEL 18 Plus suitable for apartments?
Yes — the DEL Plus range is extremely common in modern high-rise apartments and is ideal for units and townhouses on 3-phase power. If you need a new unit or a repair in an apartment, there's a strong chance it's a Stiebel Eltron DEL or DHE.
Do you install and repair the Stiebel Eltron DEL 18 Plus?
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