Replacing a gas boiler: planning the budget
A replacement quote should identify what is retained, adapted and replaced. The boiler price alone cannot make offers comparable when connections, controls or commissioning services differ.
Editorial update on 18 September 2026
Break down the replacement
Request separate items for removal, equipment, connections, flue and condensate disposal, controls and commissioning. Identify reused components, exclusions and work needing further checks.
Distinguish maintenance from inspection
Creos states that the gas installation must be inspected every four years by an authorised professional. This inspection is distinct from maintenance contract services. Request the scope, frequency and price of each proposed service.
Compare alternatives without assuming a grant
Klimabonus 2026 lists heat pumps and non-fossil hybrid systems among eligible equipment. This does not establish eligibility for a gas boiler replacement or a heat pump with gas backup. Have the specific project checked before deducting a grant from the budget.
The three budget levels
Where your money goes
- RemovalOn quotationSpecify removed equipment, handling and disposal.
- EquipmentOn quotationDetail the model, proposed output and hot water production.
- AdaptationsOn quotationIdentify connections, ducts and controls.
- Commissioning and follow-upOn quotationDistinguish included services, documents and maintenance.
What makes the price vary
Existing installation
Components reusable or needing adaptation after assessment.
Building needs
Sizing assumptions and planned insulation work.
Access
Price handling and working constraints.
Contract scope
Separate initial services from recurring costs.
Indicative scenarios
Klimabonus 2026 lists heat pumps and non-fossil hybrid systems among eligible equipment. This does not establish eligibility for a gas boiler replacement or a heat pump with gas backup. Have the specific project checked before deducting a grant from the budget.
Frequently asked questions
Should the new boiler match the old output?
Request a justification based on the building and its use. The old model reference alone is not an assessment of current needs.
Can gas savings be guaranteed?
A general percentage is insufficient. Ask for consumption assumptions, operating conditions and the comparison method before including savings in your calculation.
How long will heating be unavailable?
After the site visit, have the planned interruption, conditions and any temporary arrangements specified. This page does not guarantee a replacement duration.
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