Troubleshooting & FAQs

Getting started: what to expect before, during and after install (link to either pdf or video step‑by‑step, including grant paperwork).

Technical documents: Download technical documents here (link to documents).

Planning & sound: plain‑English explanation of permitted development and MCS‑020 sound checks. (link to permitted development rules and MCS)

That’s by design; steady operation is how heat pumps achieve high seasonal efficiency (SCOP).

Likely yes - heat pumps run lower temperatures for higher efficiency while keeping rooms on target. If rooms don’t reach set‑points, we’ll tweak curves or review emitters.

Brief icing/defrost cycles are normal. If thick ice persists or the unit repeatedly trips, contact support.

Yes - we provide national servicing, remote monitoring and customer contact routes. For Social Housing Providers

From Jan 2026, Ofgem will regulate heat networks; access to the Energy Ombudsman started April 2025. Many operators, including us, also enrol with Heat Trust. We design commercial/operational models to align with these protections.

Yes – to enhance the efficiency of our heat networks even further, we can incorporate our comprehensive heat pump, battery storage and smart controller which is then optimised by our unique Flow platform to deliver customer savings of up to 50% vs standard heat pump solutions.

We run a full CP1 aligned design/commissioning plan and coordinate engineering, manifold civils, plantroom install, and plot interfaces to your build programme. Early checks include site electrical capacity and plot typologies to derisk commissioning.

We specify compliant heat metering and interoperable billing solutions, supporting both options for payments and with app/portal access. Fixed and usage charges are transparently set and reviewed annually by the operator.

We align to CIBSE CP1: Heat Networks - Code of Practice across the lifecycle (feasibility, design, build, commissioning, O&M). CP1 (2020) is the current reference and is free to download; an updated edition is scheduled for release soon. For heat pumps under 45kW we adhere to the MCS standards.

Yes - our solution is engineered to meet or exceed Part L and the Future Homes Standard intent for lowcarbon heat in new dwellings. (Government notional building guidance and FHS policy confirm the shift to lowcarbon systems from 2025.)

We offer funded heat networks along the same principles that other utilities, such as gas and electricity, operate. We pay for the heat network and are responsible for operating and maintaining the network once it is built. For a new build housing development our solutions typically cost £3500-£4500 per plot for the full turnkey solution.

Rendesco is the most experience low carbon heat network provider in the UK and is able to recommend the most suitable heat network for your development. We use different heat sources for our networks depending on each specific sites needs, but we will always use air source, ground source and/or water source heat pumps to provide the heating and hot water. Our heat network solutions can be broadly split into two types: Centralised, and Decentralised. Centralised heat networks - sometimes called district heating or 4th generation heat networks - have an energy centre on site which produces the heating and hot water for the development, and then each home has its own Heat Interface Unit to take heating and hot water from the network as required. Decentralised heat networks - sometimes called ambient heat networks, 5th generation networks, or shared ground loops (if geothermal heat is used as the heat source) – circulate ambient temperature fluid through the network to provide the primary source of heat (and sometimes cooling too) for the heat pumps in each property. We’ll apply the approach that unlocks planning, manages electrical capacity, and optimises lifetime performance for your development.

Yes - BIM models, coordinated schematics, point lists, and O&M manuals. For homeowners

Both. We design central plant with LTHW distribution (and, where applicable, returntemperature control per CP1 thinking) or distributed WSHP/ASHP at point of use; we’ll advise on lifecycle, resilience and control.

Our project management teams are experts in deliver our heat pump and heat network projects on time and on budget. We sequence to minimise downtime (e.g., temporary plant, zoned changeovers), use offsite fabrication where beneficial, and define hold points for quality and safety (lifting plans, hot works, etc.).

Yes. Rendesco have developed an industry leading O&M division which incorporates our remote monitoring platform and our in house engineering teams.

Yes. We help clients prepare robust applications and technical packs to gain project funding.

Yes - our designs support Approved Document L, Volume 2 compliance for nondomestic buildings, and we keep schemes aligned with the direction of travel under the Future Buildings Standard.

We manage commissioning in line with CIBSE guidance and with functional performance testing, seasonal optimisation plans and softlandings style aftercare.

We typically deliver open protocol integration (e.g., BACnet and Modbus) with point lists and sequence narratives for smooth handover to your BMS.

Yes. We design hybrid or staged solutions (lead heat pump/assist boiler, heatrecovery chillers, etc.) with clear control sequences and hydraulic separation where needed, and we meter subsystems so performance can be verified against the design intent (TM39 + IPMVP).

We design domestic hotwater systems so they meet HSE HSG274 Part 2 control measures (e.g., storage ≥60 °C, distribution ≥50 °C where temperature is the control method) or an agreed riskmanaged regime, with periodic pasteurisation or auxiliary topup where appropriate.

Sometimes. We have drilled thousands of boreholes across the UK and continue to monitor these borehole fields with live telemetry. This means that we usually don’t require a TRT to provide a firm price. However, we recognise that some customers want a TRT and we can carry them out if it is preferred, always per GSHPA Vertical Borehole Standard and associated guidance.

We provide full lifecycle support: concept and feasibility, detailed design, borefield and plant design, installation, drilling (if required), commissioning, and ongoing O&M with remote monitoring. We design to CIBSE AM17 for large heatpump installations and, where multibuilding connections are involved, to CP1 for heat networks. Which technical standards and codes do you work to? Design & integration: CIBSE AM17 for large nondomestic heat pumps; TM54 for designstage operational energy; TM39 for metering strategy. Heat networks (if applicable): CIBSE CP1 (2020) from feasibility to O&M (2025 update pending). Refrigerants & safety: BS EN 378 series and related guidance on A2L/natural refrigerants. Commissioning & handover: CIBSE Commissioning Code M (2022) and Code R (refrigerating systems). Hydronic quality: BSRIA BG 29/2021 (precommission cleaning) and BG 50/2021 (closedsystem water treatment). Water hygiene (DHW): HSE ACOP L8 & HSG274 Part 2.

We have extensive experience with both open and closed loop borehole solutions for heat pump systems. We also evaluate openloop/river/lake options where viable, complying with EA permitting.

For our centralised networks, residents see a fixed monthly charge plus a kWh usage charge; for our decentralised networks, residents will see a fixed monthly charge only. Where possible, PAYG users can top up via app/phone/PayPoint. We provide transparent tariff and welcome pack materials. For Contractors & Consultants

Your metering/billing partner streamlines resident onboarding and final bills; for decentralised models (with indwelling heat pumps) your void policies can include a “heat available” standing charge while the property is empty.

We implement extra support processes (alternative bill formats, nominated contacts, password schemes and welfare checks) consistent with Heat Trust good practice.

Residents already have access to the Energy Ombudsman (since 1 April 2025). Ofgem begins regulating networks 27 January 2026, with registration and further duties phasing to Jan 2027. We support you to align tenancy/lease packs and resident comms.