Energy Performance Direct

Balancing & Weather Compensation
The foundation of efficient, comfortable heat-pump heating

A heat pump only performs well when two things are right:

Water flows evenly through the system (balancing)

The heat pump alone decides flow temperature (weather compensation)

If either is wrong, no amount of tweaking will fix efficiency or comfort.

This section explains the correct order, then gives a realistic 30–60 day setup timeline.

Part 1: Balancing the heating system
Making sure heat reaches every room evenly

Balancing is the process of restricting flow to nearby emitters so distant ones receive enough heat.

This must be done before weather compensation tuning.

Step 1: Work out the order of the system

You need to know which radiators or underfloor loops are:

Closest to the heat pump

Furthest from the heat pump

You do not need drawings — use practical observation.

Ways to determine order

Trace the main flow pipe from the heat pump

Observe which radiators warm up first from cold

Assume long pipe runs, upper floors, and extensions are furthest away

Accuracy matters less than consistency.

Step 2: Start with everything fully open

Fully open all radiator lockshield valves

Fully open all TRVs

Leave the system running for at least 24 hours

This establishes a baseline.

Step 3: Protect the furthest emitters

You do not start by adjusting the furthest radiators.

Instead, you gradually restrict flow to the nearest ones.

Why

Nearby radiators steal flow

Water returns too quickly

The heat pump reduces output prematurely

Step 4: Close down the nearest radiators slowly

For the radiator closest to the heat pump:

Adjust the lockshield valve only

Close it ¼ turn

Leave everything else unchanged

Wait 24 hours

Then move to the next nearest radiator and repeat.

Do not:

Touch TRVs during balancing

Adjust more than one radiator per day

Step 5: Observe over days, not hours

After each adjustment, look for:

Distant rooms becoming warmer

Reduced temperature differences between rooms

Quieter system operation

More stable heat pump running

Heat pumps respond slowly.
Fast changes destroy cause-and-effect.

Underfloor heating balancing

If you have underfloor heating:

Each loop must be balanced

Longer loops usually need more flow

Shorter loops usually need less

Adjust:

One loop at a time

In small steps

With at least 48 hours between changes

UFH responds even more slowly than radiators.

What “balanced” feels like

All rooms broadly similar in comfort

No rooms racing ahead

No rooms lagging badly behind

No constant TRV shutting

Flow temperatures can be reduced later

Once this is achieved, stop adjusting.

Part 2: Weather compensation setup
Letting the heat pump run continuously and efficiently

Weather compensation should be the only control deciding how hot the system runs.

Step 1: Remove the thermostat from control

Set the main room thermostat high (typically around 28–30 °C).

This does not heat the house to that temperature.

It simply prevents the thermostat from:

Switching the heat pump on and off

Causing cycling

Forcing higher flow temperatures

The thermostat now acts only as a safety limit.

Step 2: Understand the curve (in plain terms)

Weather compensation links:

Outdoor temperature
→ Flow temperature

Typically defined between two outdoor points, for example:

Cold weather (e.g. −5 °C)

Mild weather (e.g. +15 °C)

The heat pump draws a straight line between them and follows it automatically.

Step 3: Start with a sensible baseline

If a design curve exists, use it.

If not, start conservatively — comfort first, optimisation later.

Let the system run continuously for at least 48–72 hours before making any changes.

Step 4: Measure indoor temperature properly

Do not tune from a single wall thermostat.

Use:

Portable digital thermometers

Multiple rooms (warm, cool, living, sleeping)

You are looking for:

Stability

Consistency

Gentle changes, not swings

Step 5: Tune the cold end first (micro-adjustments)

In colder weather, adjust the cold outdoor end of the curve first.

This adjustment has a small but powerful effect.

Method

Reduce the cold-end flow temperature slightly

Leave everything else unchanged

Wait 2–3 days

Monitor indoor temperatures

If the house drifts cool, reverse slightly.

Never chase instant results.

Step 6: Adjust the warm end later

Once cold-weather behaviour is stable:

Fine-tune mild-weather performance

Adjust the warm end slightly up or down

Again, wait several days between changes

This mainly affects spring and autumn behaviour.

What correct weather compensation feels like

Long, quiet run times

No obvious on/off cycling

Radiators warm, not hot

Stable indoor temperature

Falling electricity use over time

If it feels boring, it’s working.

Printable 30–60 Day Heat Pump Setup Timeline
Days 0–7: Stabilisation

Actions

Do nothing except bleed air

Fully open all valves

Let the building warm through

Monitor

Indoor temperatures

Noise

Any air in radiators or UFH

Days 7–21: Balancing phase

Actions

Identify system order

Adjust one lockshield per day

Balance UFH loops if present

Monitor

Room-to-room temperature differences

Distant rooms improving

Overall comfort stability

Days 21–35: Weather compensation baseline

Actions

Set room thermostat high

Confirm weather compensation is sole control

Run system continuously

Monitor

Average indoor temperature

Heat pump run time (longer is better)

Daily electricity use

Days 35–50: Cold-end tuning

Actions

Small reductions to cold-end flow temperature

One change every 2–3 days

Monitor

Indoor temperature stability

Comfort during colder periods

Any cycling behaviour

Days 50–60: Warm-end refinement

Actions

Fine-tune mild-weather performance

Make very small adjustments

Monitor

Spring/autumn comfort

Overheating in milder weather

Overall efficiency trend

Ongoing rule

One small change → wait several days → assess calmly

A heat pump rewards patience more than intervention.

Once set correctly, it becomes quiet, predictable, and cheap to run — exactly as intended.

New website www.energyperformancedirect.co.uk check it out.

Energy Performance Direct | EPCs & MEES Compliance | Exeter & South West UK Energy Performance Direct - Accredited EPCs, energy advice, and MEES compliance support across Exeter and South West UK. Domestic & commercial assessments, SAP calculations, and landlord MEES guidance.

New website! Check it out

Energy Performance Direct | EPCs & MEES Compliance | Exeter & South West UK Energy Performance Direct - Accredited EPCs, energy advice, and MEES compliance support across Exeter and South West UK. Domestic & commercial assessments, SAP calculations, and landlord MEES guidance.

New Website Launched: HousePlanDirect.com

I’m excited to share the launch of my new website: www.houseplandirect.com

It’s been built to make floor plan conversion simple, fast, and reliable — especially for anyone needing floor plans, lease plans, or clean digital versions of older drawings. The site also supports clients who want accurate plans for planning applications, marketing, or renovations.

If you work with property, architecture, surveying, estate management, or construction and often need plans cleaned up or converted, feel free to take a look:

www.houseplandirect.com

I would be eternally grateful to hear any feedback or suggestions.

Emergent | Fullstack App A product of emergent.sh

Big changes are coming with MEES and EPC rules: from April 2025 every rented property must have a valid EPC, and minimum standards currently set at E are rumoured to rise to C by 2027 and B by 2030.

This is a great chance to make buildings warmer, cheaper to run, and more attractive to tenants.

I help property managers, landlords, and owners plan simple, cost-effective improvements to hit the targets without stress.

If you’d like clear advice on upgrading your EPC, please get in contact.

MEES Update for Commercial Property Owners: What You Need to Know

The UK government is set to tighten Minimum Energy Efficiency Standards (MEES) for commercial properties significantly in the coming years:

EPC C by 2027

EPC B by 2030

EPCs required every 5 years (instead of every 10)

Stricter enforcement and penalties

Potential removal of some exemptions

Possible incentives for green upgrades

This means your building’s energy performance is no longer just a “tick box” — it’s critical for compliance, tenant demand, and avoiding fines.

What does this mean for you?

Start early with EPC assessments and retrofit planning.

Consider cost-effective upgrades: insulation, lighting, HVAC, renewables.

Evaluate exemptions carefully with professional advice.

Stay ahead to protect your asset value and attract quality tenants.

I’m here to help you navigate MEES compliance with:

Accurate EPC assessments aligned with new standards

Practical retrofit recommendations

Exemption calculations and advice

Operating since 2009 and offering energy performance certificates on both domestic and commercial buildings to property professionals and building owners throughout the UK. Energy Performance Direct has a wealth of experience in surveying a variety of building types and for a number of requirements. We endeavour to remain competitive on price and add value where possible. We are a local independent company and have a focus on great customer service and fast turnaround times. Services include EPCs, MEES advice, SAP calculations, SBEM calculations, U-value calculations, Floor plans, Lease plans, Retrofit Assessments, and Retrofit Coordinator services on both commercial and domestic properties throughout the UK. Save Energy, Save Money, and Save the Planet.

Your Octopus Energy Referral code
Use this link to sign up to Octopus -

Octopus Energy - A new breed of energy supplier. Which? recommended for 6 years running and the UK's most awarded supplier. One of Europe's largest investors in renewable energy. Switch today!

WMO update: 50:50 chance of global temperature temporarily reaching 1.5°C threshold in next five years Geneva, 9 May 2022 (WMO) - There is a 50:50 chance of the annual average global temperature temporarily reaching 1.5 °C above the pre-industrial level for at least one of the next five years – and the likelihood is increasing with time, according to a new climate update issued by the World Meteor...

Please share.

We can help with new build EPC projects, floor plans, lease plans, planning applications. Don't waste this time at home lets get your projects T'd up and ready to go as soon you are.

We can help with new build EPC projects, floor plans, lease plans, planning applications. Don't waste this time at home lets get your projects T'd up and ready to go as soon you are.

Progressive group of councillors welcome Labour U-Turn on Clifton Hill The Progressive Group on Exeter City Council has welcomed the U-turn by the Labour run council on the Clifton Hill. While the Sports centre and car park will be replaced with 44 new houses, the Council has agreed that the green space, ski slope and golf range will now be saved.