Vaillant ecoFIT Sustain 618 18kW System Boiler (0010025272) is a cost-effective, high-efficiency heating solution designed for medium-sized homes, new-build developments, landlords and large-scale housing projects. With an 18kW output and ErP A-rated efficiency, this system boiler provides reliable central heating and works with a separate unvented hot water cylinder to deliver dependable domestic hot water performance.
VaillantecoFIT Sustain 61818kW System BoilerNatural Gas
Output
18kW
Efficiency
ErP A-Rated
Fuel
Natural Gas
Model
0010025272
Reliable 18kW Output
The 18kW output provides dependable central heating for medium-sized homes and makes the boiler well suited to new-build housing projects and residential developments.
Intelligent Modulation
With a 1:4.5 modulation ratio, the boiler adjusts its heat output according to demand, helping improve efficiency and reduce unnecessary energy consumption.
Flexible Flue Options
Rear, horizontal and vertical flue configurations provide installation flexibility across different property layouts and development projects.
Built for Developments
The ecoFIT Sustain range provides a straightforward, cost-effective and low-maintenance heating solution for builders, landlords, developers and housing associations.
Specifications
| Brand | Vaillant |
| Model | ecoFIT Sustain 618 |
| Product code | 0010025272 |
| EAN | 4024074850367 |
| Boiler type | System boiler |
| Output | 18kW |
| Fuel type | Natural Gas |
| Efficiency rating | ErP A-Rated |
| Modulation ratio | 1:4.5 |
| Hot water cylinder | Required – compatible with unvented cylinders |
| Installation | Wall-mounted |
| Flue options | Rear, horizontal and vertical |
| Noise level | Ultra-quiet operation |
| Flow temperature | Adjustable |
| Warranty | 2 years |
System boiler & installation
The Vaillant ecoFIT Sustain 618 is a sealed system boiler designed to work with a separate unvented hot water cylinder. It connects directly to the mains water supply and incorporates key system components to simplify installation. The wall-mounted design and flexible rear, horizontal and vertical flue options make it suitable for a variety of retrofit, new-build and housing development installations.
Warranty & next steps
The ecoFIT Sustain 618 is supplied with a 2-year warranty, making it a practical choice for builders, developers, landlords and housing associations seeking a straightforward heating solution. Before purchasing, check the required cylinder capacity, installation clearances, flue configuration, system requirements and current manufacturer specifications to ensure the boiler is suitable for the intended property.
At GetPlumb, we strive to provide reliable and cost-effective delivery options to our customers. Please review our shipping policy below.
🆓 Free Local Delivery (Orders £100 & above)
We offer FREE delivery on orders £100 or more
for selected local areas.
Eligible Postcodes Include:
- RG*
- SL*
- OX10*, OX11*, OX49*
- HP1*, HP3*, HP8*, HP9*, HP10*, HP11*, HP12*, HP13*, HP14*
- WD*, HA*, UB*, TW*, KT*
- W1* – W9*
- NW*, SW*
Delivery Time: 2–4 working days
Shipping Cost: £0.00
📦 Standard Shipping (Weight-Based Rates)
For orders that do not qualify for free delivery, standard
shipping rates apply based on total cart weight.
- For cart weight between 0–2 kg, the shipping cost is £4.50 with a delivery time of 2–4 working days.
- For cart weight between 2–24 kg, the shipping cost is £9.99 with a delivery time of 2–4 working days.
- For cart weight between 24 kg and above, the shipping cost is £60 with a delivery time of 2–4 working days.
🧱 Block Salt (Harvey’s) – Unit-Based Shipping
This rate applies only to Harvey’s block salt products.
- £7.99 is charged for every 3 items.
- The charge increases by £7.99 for each additional set of 3 items.
Examples:
- 1–3 items → £7.99
- 4–6 items → £15.98
- 7–9 items → £23.97
Delivery Time: 2–4 working days
📏 Large / Long Items (Length-Based Shipping)
For oversized items where the product length is 1.5 metres or more:
Conditions:
- Product length ≥ 1.5 m
- Cart weight ≤ 40 kg
Shipping Cost: £18.00 (flat rate)
Delivery Time: 2–4 working days
Collection from Store
Customers can also choose to collect their order from our store in
Reading, UK, at no additional charge. For any questions regarding shipping, please contact our support team at online@getplumb.co.uk.
