Assess First. Recommend Second.
A straightforward combi range with a smaller casing to discuss when appliance space and installation budget are priorities.
Model names identify discrete variants. The heating and hot-water columns reproduce the stated output basis from the cited manufacturer documentation; they are not interchangeable. Where a model label differs from rated output, compare the rating rather than rounding it to the name. An oil model band describes that appliance’s settings, not every integer as a separate model to buy.
| Exact model / fuel variant | Fuel | Heating output (kW) | DHW output (kW) |
|---|---|---|---|
| Greenstar 1000 24kW NG · Part 7 736 902 178 | Gas (NG) | 24 Maximum rated CH at 80/60°C; maximum at 50/30°C is 26.3 kW | 24 |
| Greenstar 1000 30kW NG · Part 7 736 902 179 | Gas (NG) | 24 Maximum rated CH at 80/60°C; maximum at 50/30°C is 26.3 kW | 29.5 |
| Greenstar 1000 24kW with LPG conversion kit 7 724 002 660 | Gas (LPG) | Not independently verified LPG kit compatibility verified in manufacturer conversion manual 6721109537, page 2; separate converted CH/DHW kW ratings not published in that manual and remain unavailable | Not independently verified |
| Greenstar 1000 30kW with LPG conversion kit 7 724 002 662 | Gas (LPG) | Not independently verified LPG kit compatibility verified in manufacturer conversion manual 6721109537, page 2; separate converted CH/DHW kW ratings not published in that manual and remain unavailable | Not independently verified |
The 30 kW model’s current product page labels maximum DHW output as 29.5 kW; the general product guide rounds its label to 30 kW. The exact installation manual and fuel conversion instructions govern the final specification.
LPG conversion compatibility is verified in manufacturer manual 6721109537 (2025/10), page 2: kit 7 724 002 660 for the 24 kW model and kit 7 724 002 662 for the 30 kW model. These are installer-fitted conversion accessories, not separate factory LPG appliances. The kit manual does not publish separate converted CH/DHW kW ratings; these remain unavailable and natural-gas ratings are not substituted.
Unless an operating temperature is expressly stated, the current product-page output label does not specify its measurement temperature. The exact installation literature must be checked before technical design; no modulation range or seasonal performance claim is inferred here.
Its simple fascia keeps everyday adjustments accessible. The compact wall-mounted format avoids a separate cylinder, while water supply and safe service access still determine suitability.
A straightforward combi range with a smaller casing to discuss when appliance space and installation budget are priorities.
A combi supplies heating and hot water within the appliance arrangement and normally avoids a separate household hot-water cylinder. Check the measured incoming mains pressure and flow, the taps and showers used together, and the distances to outlets. Increasing the appliance rating cannot create a water supply the home does not receive. Oil combis have a different internal hot-water arrangement from gas combis; do not compare the printed numbers as interchangeable flow performance.
For a gas installation, assess the available gas supply, flue route, condensate disposal, controls, electrical connections and service clearances. Natural gas and LPG are distinct fuel configurations: a listed LPG variant does not authorise using the natural-gas appliance unchanged. Confirm the exact part number and any commissioning requirements in the installation instructions. SwiftHeat checks installer competence and the required installation scope before accepting the work.
A like-for-like arrangement and a conversion have different scopes. Check pipework condition, system cleaning and protection, controls, siting and future access before comparing quotations. Removing a cylinder, relocating the boiler or changing fuel can affect the whole project. Bedroom count, bathroom count and the model designation cannot replace a heat-loss calculation and a water-supply assessment.
5 years under the current manufacturer schedule when fitted with a Worcester Bosch or third-party system filter. No longer model-specific extension is listed in that schedule. Registration, servicing and the applicable terms remain required; your quotation confirms the eligible package.
The manufacturer guarantee and SwiftHeat service offers are separate. Your written quotation must identify the exact cover and eligible accessories. Keep installation and commissioning records, complete manufacturer registration in the required time and arrange the annual servicing required by the applicable terms. The installer must establish eligibility before promising extended cover.
Current guarantee schedule · Manufacturer guarantee terms · Arrange ongoing servicingVerified 1 October 2026. Product availability and manufacturer terms can change; the final specification is checked again at quotation.
Exact manufacturer product information · Verified technical source 1 · Verified technical source 2 · Official manuals and technical literatureThe 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 advicePrice confirmed following assessment for this configuration. The general New boiler installations from £1,790 inc. VAT offer does not apply to every model or property.
From or indicative prices remain provisional. SwiftHeat issues a written fixed quotation for the agreed scope after the appropriate property and installation assessment, technical checks and warranty-package verification. Remote information gathering may be suitable initially; a home survey is required where the necessary checks cannot be completed remotely.
We 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
