Underfloor Heating (Central Heating & Radiators) in Blenheim
We design and install water‑based (hydronic) systems that circulate low‑temperature water through in‑slab pipework or wall‑mounted radiators. Correctly set up, hydronic central heating provides steady room temperatures, reduced drafts and a comfortable, dry indoor environment. Our scope covers concept advice, heat source selection, manifold and pipe layout, zoning and controls, installation, commissioning and ongoing servicing.
For technical context, New Zealand’s Building Code sets energy efficiency expectations for building elements, including specific considerations for floors with embedded heating. You can review the current H1 Energy Efficiency information on MBIE’s Building Performance website, which is the basis for design decisions we make on insulation and detailing: H1 Energy efficiency. The corresponding Acceptable Solution H1/AS1 discusses additional insulation requirements where heating is embedded in floors, which is why we plan slab and edge insulation carefully during design and before pours: H1/AS1 Acceptable Solution (PDF).
Our process
Talk to Phil now on 027 481 9808
Hydronic underfloor (in‑slab or in‑screed)
Low‑temperature water runs through durable PEX pipework embedded in the slab or screed, creating gentle radiant warmth from the floor up. Even heat, silent operation and no wall clutter make this ideal for open‑plan living and polished concrete or tiled floors.
Radiators
Wall‑mounted radiators are quick to respond and perfect for renovations or upstairs rooms. They pair with the same boiler or heat source as underfloor zones and can be balanced room by room. Modern panels are compact, efficient and easy to keep clean.
Heat sources and integration
We integrate hydronic systems with suitable heat sources for your site and preference, including efficient gas boilers. Where gas appliances are involved, only licensed gasfitters may install and certify the work in New Zealand, and we supply the correct documentation for council and insurance records.
Boilers and central heating integration
If your project includes hydronic underfloor heating or radiators, we integrate gas boilers and control systems for quiet, even warmth. We plan zones and thermostats around how spaces are used, balance comfort with efficiency, and provide clear guidance on daily operation and seasonal settings. Our commissioning checks ensure pumps, valves and safety devices are set correctly before handover.
Maintenance and servicing
Hydronic systems are low‑maintenance when set up correctly. We recommend a simple annual check to verify pressures, inhibitor levels, pump operation and valve settings. Radiators may need occasional bleeding in the first season as micro‑air releases, and underfloor manifolds benefit from a quick inspection. We keep records so future servicing is fast and predictable.
Controls and zoning
Modern controls make central heating simple. We set up thermostats and time schedules by zone, calibrate sensor placement and fine‑tune pump speeds and mixing valves so rooms warm evenly without overshoot. You can start with a straightforward wall thermostat or choose app‑enabled control for remote scheduling and energy insights. Our handover includes settings for everyday use and seasonal adjustments.
We coordinate with your architect, flooring supplier and builder so coverings are selected to suit low‑temperature radiant heating and warranties remain intact.
Maintenance and servicing
Annual servicing keeps gas appliances efficient and safe. We check burners, flues and seals, verify regulators and valves, confirm ventilation and carbon monoxide safety, and provide a short report with any recommended actions. For hot water systems we descale heat exchangers where appropriate and confirm temperature control settings for comfort and energy efficiency. Scheduling routine maintenance reduces unexpected breakdowns and extends appliance life.
Ready to plan warm, even comfort?
Tell us about your plans and timeframes and we will recommend a practical path forward. Whether you are building new or upgrading an existing home, AM/PM Plumbing & Gas designs and installs underfloor heating and radiator systems that feel great and run efficiently in Marlborough.
Yes. Low‑temperature radiant systems deliver steady comfort and pair well with well‑insulated slabs and edges. Correct design, zoning and control strategies keep running costs sensible and comfort consistent.
Absolutely. Many Blenheim homes run underfloor on the ground level with compact radiators for bedrooms or bathrooms upstairs. Everything is managed by one set of controls and the same heat source.
We install in‑slab during new builds or in‑screed during renovations. We will coordinate with your builder and structural engineer to confirm depths, insulation and pour sequencing so pipes are protected and properly documented.
Typical surface temperatures are a few degrees above room temperature - comfortable to the touch without feeling hot. We design for comfort first, avoiding the high flow temperatures that can cause overshoot.
Heating systems generally fall within standard building consent processes, but embedded heating and gas appliances require specific compliance steps and certification. We handle documentation and will advise early if any element of your scope triggers consent.