Plumbing & Heating Technical Proposal: Guide for Public Sector HVAC and Sanitary Contracts
Plumbing, heating, ventilation, and air conditioning (HVAC) contracts are among the most technically complex in public procurement. Whether replacing a boiler plant, installing MVHR systems, renovating sanitary networks, or multi-technical maintenance, the proposal must demonstrate in-depth expertise on equipment, thermal regulations (RE2020), and project delivery in occupied buildings.
Specific buyer expectations for HVAC contracts
HVAC contracts are often the most complex lots in a construction or renovation project. The buyer evaluates: your understanding of the existing installation (renovation) or project (new build), equipment sizing (heat loss calculations, thermal assessments), compliance with RE2020 and relevant NF DTU standards (series 60 for plumbing, series 65 for heating), your ability to maintain occupant comfort during works, and your staff qualifications (F-gas certificate, gas competency PGN/PGP).
A proposal that lists equipment brands without explaining the sizing logic and selection rationale will not pass the review committee.
Recommended structure for an HVAC proposal
An effective HVAC proposal covers:
Assessment and sizing
Present your sizing approach: thermal assessment (calculation method, software used), sanitary flow calculations, network sizing (pressure losses). For renovation, describe your survey of the existing installation and network condition.
Equipment selection and technical solutions
For each major item (boiler, heat pump, AHU, MVHR, DHW cylinders, tapware), detail: proposed model and manufacturer, performance data (efficiency, COP, noise level, energy class), compliance with CCTP and RE2020 requirements, and your selection rationale versus alternatives. Propose at least one variant if the regulations permit.
Works in occupied buildings
In renovation, maintaining heating and hot water during works is critical, especially in care homes, hospitals, or schools. Describe your switchover plan: temporary solutions, phased shutdowns, occupant communication. This is a strongly differentiating criterion.
Commissioning, testing, and maintenance
Detail planned tests: network pressure testing, hydraulic balancing, flow measurements, temperature checks. Specify the operating staff training programme and as-built documentation (O&M manual, H&S file). If the contract includes maintenance, describe your preventive maintenance programme (visit frequency, wear parts, call-out response).
Common mistakes in HVAC proposals
No design calculations — Proposing equipment without justifying the sizing is a deal-breaker. The buyer or their consultant will check that proposed capacities match the building's requirements.
RE2020 non-compliance — Proposing a system that doesn't meet RE2020 thresholds (or RT2012 in renovation) is disqualifying.
Ignoring service continuity — In renovation, not detailing how occupants will be heated and supplied with water during works is a serious omission.
Missing qualifications — The F-gas handling certificate is mandatory for any equipment containing refrigerant. Its absence blocks your candidature.
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