Assess First. Recommend Second.
Choose the system arrangement before choosing the eco range.
Vaillant’s ecoTEC and ecoFIT names cover different appliances. Separate on-demand combi delivery from a system or regular boiler working with a cylinder before comparing outputs, siting and guarantee terms.
This guide reconciles the current homeowner directory, professional product directory and linked domestic and March 2025 specification literature. Model availability and the exact generation are reconfirmed before quotation.
The remastered on-demand range, with four distinct hot-water variants.
Model labels: 26 kW | 32 kW | 36 kW | 40 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: Compare the hot-water rating separately from the heating load: a 40 kW label does not mean a 40 kW heating requirement.
Explore ecoTEC plus Combi
The 940 combines a combi boiler with integrated hot-water storage.
Model labels: 40 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: Check the deeper casing, available space and actual household demand before choosing integrated storage; it is not a substitute for measured water-supply performance.
Explore ecoTEC plus Storage Combi
Three conventional combi labels with on-demand hot water.
Model labels: 24 kW | 28 kW | 30 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: This is a combi-only family. Compare the actual CH and DHW figures before treating the model label as its heating size.
Explore ecoTEC pro Combi
A compact combi family with three hot-water output choices.
Model labels: 25 kW | 30 kW | 35 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: A compact casing does not remove service-clearance requirements. Check water flow and simultaneous demand before selecting the combi output.
Explore ecoFIT pure Combi
Green iQ combi models documented in Vaillant’s current linked domestic literature.
Model labels: 35 kW | 43 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: The 835 and 843 are documented by the manufacturer but absent from the homeowner overview’s combi cards; confirm supply and generation before specifying.
Explore ecoTEC exclusive Combi
A specification-market combi range with three hot-water labels.
Model labels: 24 kW | 28 kW | 34 kW
Warranty: Project guarantee duration requires confirmation
Range: Specification / project range
Key takeaway: The three labels change hot-water capacity while the verified heating maximum at 80/60°C stays at 18.5 kW. Project requirements and guarantee terms need confirmation.
Explore ecoTEC sustain Combi
A compact combi configuration from Vaillant’s specification range.
Model labels: 25 kW | 30 kW | 35 kW
Warranty: Project guarantee duration requires confirmation
Range: Specification / project range
Key takeaway: The March 2025 specification brochure lists the same CH maximum for all three combi labels. DHW labels and verified flow are shown without inventing a missing DHW heat-output figure.
Explore ecoFIT sustain Combi
Six remastered system outputs for an assessed separate-cylinder installation.
Model labels: 10 kW | 15 kW | 20 kW | 25 kW | 30 kW | 35 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: Cylinder-reheat ratings can exceed the heating rating. The separate cylinder, storage capacity and recovery must be assessed as part of the complete system.
Explore ecoTEC plus System
48 and 64 kW labels for specialist larger-load projects.
Model labels: 48 kW | 64 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Specialist large-load assessment
Key takeaway: These are labelled light-commercial products by Vaillant. They are retained for larger domestic-load research and excluded from the general homeowner Finder shortlist.
Explore ecoTEC plus Large Output System
Five cupboard-oriented system outputs for separate stored hot water.
Model labels: 12 kW | 15 kW | 18 kW | 25 kW | 30 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: Choose the boiler and cylinder together: cylinder capacity, recovery and controls determine the stored-water result.
Explore ecoFIT pure System
The 627 Green iQ system boiler with a separate hot-water cylinder.
Model labels: 27 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: The 27 kW model label is distinct from the 24.7 kW CH maximum at 80/60°C and the 30 kW cylinder-reheat maximum.
Explore ecoTEC exclusive System
Three system labels for specification projects retaining a hot-water cylinder.
Model labels: 15 kW | 18 kW | 30 kW
Warranty: Project guarantee duration requires confirmation
Range: Specification / project range
Key takeaway: Only the 15, 18 and 30 kW system labels are confirmed in the current specification table; the directory’s combined range list must not be applied to every arrangement.
Explore ecoFIT sustain System
The heat-only ecoTEC plus range for a cylinder-based heating arrangement.
Model labels: 12 kW | 15 kW | 18 kW | 24 kW | 30 kW | 35 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: Retaining an open-vent arrangement may limit conversion work, but boiler, tanks, pump and cylinder condition still need assessment.
Explore ecoTEC plus Open Vent
Six regular-boiler output labels with a separate cylinder and external system components.
Model labels: 12 kW | 15 kW | 18 kW | 25 kW | 30 kW | 35 kW
Warranty: Up to 10 years, subject to the eligible package
Range: Homeowner / domestic range
Key takeaway: Do not confuse the pure 425 / 25 kW with the ecoTEC plus 424 / 24 kW. Each belongs to a different family with its own ratings.
Explore ecoFIT pure Open Vent
Regular-boiler variants for cylinder-and-external-component specification projects.
Model labels: 15 kW | 18 kW | 30 kW
Warranty: Project guarantee duration requires confirmation
Range: Specification / project range
Key takeaway: The current manufacturer table confirms 15, 18 and 30 kW labels for this arrangement. Other outputs in the range-wide directory belong to different configurations.
Explore ecoFIT sustain Open Vent| Family / arrangement | Model labels | Warranty position |
|---|---|---|
| ecoTEC plus Combi · Combi | 26 kW | 32 kW | 36 kW | 40 kW | Up to 10 years, subject to the eligible package |
| ecoTEC plus Storage Combi · Combi | 40 kW | Up to 10 years, subject to the eligible package |
| ecoTEC plus System · System | 10 kW | 15 kW | 20 kW | 25 kW | 30 kW | 35 kW | Up to 10 years, subject to the eligible package |
| ecoTEC plus Open Vent · Heat-only / regular | 12 kW | 15 kW | 18 kW | 24 kW | 30 kW | 35 kW | Up to 10 years, subject to the eligible package |
| ecoTEC plus Large Output System · System | 48 kW | 64 kW | Up to 10 years, subject to the eligible package |
| ecoTEC pro Combi · Combi | 24 kW | 28 kW | 30 kW | Up to 10 years, subject to the eligible package |
| ecoFIT pure Combi · Combi | 25 kW | 30 kW | 35 kW | Up to 10 years, subject to the eligible package |
| ecoFIT pure System · System | 12 kW | 15 kW | 18 kW | 25 kW | 30 kW | Up to 10 years, subject to the eligible package |
| ecoFIT pure Open Vent · Heat-only / regular | 12 kW | 15 kW | 18 kW | 25 kW | 30 kW | 35 kW | Up to 10 years, subject to the eligible package |
| ecoTEC exclusive Combi · Combi | 35 kW | 43 kW | Up to 10 years, subject to the eligible package |
| ecoTEC exclusive System · System | 27 kW | Up to 10 years, subject to the eligible package |
| ecoTEC sustain Combi · Combi | 24 kW | 28 kW | 34 kW | Project guarantee duration requires confirmation |
| ecoFIT sustain Combi · Combi | 25 kW | 30 kW | 35 kW | Project guarantee duration requires confirmation |
| ecoFIT sustain System · System | 15 kW | 18 kW | 30 kW | Project guarantee duration requires confirmation |
| ecoFIT sustain Open Vent · Heat-only / regular | 15 kW | 18 kW | 30 kW | Project guarantee duration requires confirmation |
Current homeowner pages advertise eligible extended packages up to ten years for several ranges. The ecoTEC pro page now describes a potentially chargeable ten-year upgrade, while older brochures describe seven years. Specification-family guarantee durations are not assumed from homeowner terms. Installer eligibility, registration, protection kit, water preparation and servicing matter.
SwiftHeat’s quotation establishes the eligible cover. We do not claim myREWARDS or another manufacturer accreditation merely because a boiler appears here. Manufacturer guarantee, SwiftHeat installation cover and qualifying Care+ services are separate.
Correct specification balances calculated heat loss, water supply, household demand, space, flue routing, cylinder recovery and controls. A larger model cannot correct inadequate incoming water performance. Compatible Vaillant eBUS controls and gateways are assessed against the exact generation; existing thermostats are not presumed to offer every function.
The catalogue covers ecoTEC plus combi, storage-combi, system and open-vent arrangements; ecoTEC pro; ecoFIT pure; ecoTEC exclusive; and the domestic ecoTEC sustain and ecoFIT sustain specification ranges. The 48/64 kW light-commercial range is separately labelled for specialist larger-load assessment. Commercial ecoCRAFT and 80–120 kW boilers are outside this domestic guide.
Use the same temperature basis for central-heating figures. A combi model label normally identifies its hot-water variant, while heating, cylinder-reheat and DHW flow figures describe different functions. Final selection follows calculated heat loss and measured hot-water requirements.
No. Eligible installer registration, protection-kit or filter requirements, commissioning, system-water preparation, servicing and current terms can affect entitlement. Some upgrades may carry charges. The written quotation must confirm the actual package.
Specification ranges are domestic appliances intended for projects, including new-build or managed housing. Availability and guarantee packages need confirmation. A directory listing does not confirm stock or entitlement.
SwiftHeat UK serves Cardiff, South Wales and across the UK. Ask for an assessment of the existing system, heat loss, hot-water demand, flue, water quality, controls and installation access. Assess First. Recommend Second.
The established ecoFIT and ecoTEC plus overview routes remain the gateways to their distinct arrangements. No competing manufacturer hub has been created.
ecoFIT arrangement guide · ecoTEC plus arrangement guideSources checked 2 October 2026. Product photography and technical views are from Vaillant’s official pages and literature. Catalogue inclusion is research guidance, not a stock or installation promise.
The installed price for your selected boiler is confirmed after assessment. The quotation covers the appliance, controls, flue, system preparation and any required pipework. A conversion or relocation can have a different scope from a straightforward replacement.
New boiler installations from £1,790 inc. VAT apply to a qualifying standard, straightforward replacement: one bathroom, fewer than 10 radiators and a standard horizontal flue, subject to survey. Specification and warranty selection affect the final cost. This is a general starting offer and is not a price for every model in this catalogue.
Read the starting-package conditions0% options over 3, 6, 9 or 12 months through Humm Group Limited, subject to application, affordability, eligibility, approval and provider terms. Any applicable deposit, fees and repayment conditions are confirmed during your enquiry/application. Acceptance is not guaranteed.
Finance terms and chargesTwo free annual services and a Hive Mini are available on qualifying installations only. Every model is considered under the qualification rules; inclusion in this catalogue does not confirm eligibility. Ask us to confirm the offer in your quotation.
Ask about Care+ eligibilityPlan the maintenance your appliance requires and keep its service records. If you are considering replacement because of a fault, diagnosis can help establish whether repair is a suitable option first.
Boiler servicing · Repair adviceWe assess heat loss, heating and hot-water requirements, water supply, controls and installation access before recommending an appliance. Bedroom count or a catalogue model number alone cannot establish the right boiler.
Gas Safe registration 978273 · Serving Cardiff, South Wales and across the UK.
Understand suitable boiler types · Start the Boiler Finder · Our installation assessment · Areas we cover
