Heating Advice & Energy Efficiency Guides

Your heating. Your question.

What would you like help with?

You don’t need to know the technical answer. Choose what you’re thinking about; we’ll help you make sense of it.

Understand a problemMy heating isn’t working properlyStart with what you’ve noticed.Comfort with less wasteCould my heating cost less to run?Explore the whole system, one step at a time.Make a confident decisionDo I actually need a new boiler?Repair, improve or replace?

Explore a different way to heatCould a heat pump work here?Discover what makes a property suitable.

Choose any question below to open its advice. All guidance is available without signing in.

Follow your curiosity

My heating isn’t working properlyExplore

Start with the problem

What Are You Experiencing?

Use these starting points to understand what may need checking. A symptom can have several causes; it does not by itself identify the right repair or upgrade.

One Room Is Always Cold

Investigate radiator output, TRVs, balancing and heat loss. A room can lose heat faster than its radiator can replace it.

Some Radiators Are Hotter Than Others

Understand balancing, circulation and radiator controls. Uneven heating can have several causes; cleaning is not automatically the answer.

My Home Takes Too Long to Warm Up

Explore heat loss, emitter size, system temperature and circulation. The whole system and building need to work together.

My Heating Bills Feel Too High

Review schedules, controls, zoning, system performance and heat loss. Energy prices and the weather also affect what you pay.

My Boiler Keeps Turning On and Off

Learn about cycling, control behaviour and system demand. Some switching is normal; unusually frequent cycling needs assessment in context.

I’m Thinking About Replacing My Boiler

Understand whether repair, optimisation or replacement may be appropriate. Consider condition, reliability and the needs of your property.

If you rent, report faults to your landlord or managing agent before arranging work. Do not remove the boiler casing or attempt gas work.

Tell us what’s happening

Do I actually need a new boiler?Explore

Understand before you invest

Is the boiler really the problem?

A cold room does not automatically mean the boiler needs replacing. Controls, circulation, radiator output and heat loss can all affect comfort.

Consider the boiler’s condition, fault history and repair options alongside your heating and hot-water needs. An assessment helps separate a repairable fault from a worthwhile upgrade.

What matters when choosing a replacement?

Boiler type, property heat loss, hot-water demand, water supply, existing pipework, installation space, controls and warranty conditions all need consideration.

Understand combi, system and heat-only boilers

Find My Boiler

A useful starting point for your conversation, followed by a property assessment.

SwiftHeat UK engineer examining an open boiler — Look at the evidence before choosing the next step.

Could a heat pump work here?Explore

Air source heat pump installed beside a brick home — Suitability comes from the whole design.

A different way to deliver warmth

Start with your property, not the technology.

A heat pump needs a system designed around the heat your property loses and the temperatures its radiators or underfloor heating need.

What would an assessment look at?

Room-by-room heat loss, radiator output, hot-water storage, controls, the electrical supply and outdoor-unit siting are considered together. Installation space and your day-to-day use also matter.

Understanding these factors helps you compare a complete heating solution, rather than an appliance alone.

Explore heat-pump suitability

Explore a heating topicExplore

Explore the whole system

Six Areas of Heating Advice

Choose a subject when you want to understand it in more detail. Each one leads to relevant guidance or an assessment of your system.

Heating Controls & Zoning

Understand thermostats, TRVs, smart controls, room-by-room heating and how zoning can help control where and when heat is used.

Thermostats · TRVs · Room controls · Weather and load compensation

Read our controls and TRVs article

Radiators & Heat Distribution

Learn why radiators can heat unevenly and how balancing, sizing, circulation and system condition affect comfort.

Radiator sizing · Balancing · Circulation · System water quality

Explore radiator assessments and upgrades

Boiler Efficiency & Performance

Understand how flow temperature, modulation, boiler sizing, cycling and controls affect how efficiently a heating system operates.

Flow temperature · Condensing operation · Modulation · Boiler sizing

Read about controls and boiler efficiency

Heating Problems

Start with the symptom. Explore common reasons for cold rooms, uneven temperatures, slow heating, high energy use and poor heating performance.

Cold rooms · Uneven temperatures · Slow heating · Frequent cycling

Start with your heating problem

Repair, Optimise or Replace?

Understand when an existing heating system may benefit from servicing, repair, optimisation or replacement.

Servicing · Diagnostics · System improvements · Boiler selection

Understand your boiler options

Heat Pumps & Low-Temperature Heating

Understand heat-loss assessment, radiator sizing, controls and the considerations involved before moving to lower-temperature heating.

Heat loss · Emitter sizing · Readiness · Hot-water requirements

Explore heat-pump assessment

Could my heating cost less to run?Explore

A whole-system approach

The SwiftHeat Heating Efficiency Hierarchy

Start with the building and how heat is used. Then assess distribution, performance and whether replacement would bring worthwhile benefits.

Keep the Heat In
Insulation, draught reduction and appropriate ventilation.
Control When You Heat
Schedules, programmers and thermostats.
Control Where the Heat Goes
TRVs, smart room controls and zoning.
Distribute Heat Properly
Radiator sizing, balancing, circulation and system condition.
Optimise the Heat Source
Flow temperature, modulation and suitable controls.
Then Consider Replacement
Review servicing and repair alongside boiler replacement or a heat pump.

Assess First. Recommend Second.

This is a way to prioritise efficiency improvements. Servicing, faults and safety concerns should be addressed when needed, at any stage. Keep appropriate ventilation and follow the appliance manufacturer’s instructions when adjusting settings.

Discuss your heating efficiency

Browse supporting guides and servicesExplore

Useful next steps

Supporting Resources

Use our existing guides, tools and service pages to explore your options. News & Updates remains the home for company news and time-sensitive industry developments.

A useful way to think about warmth

Heat is made. Delivered. Kept.

Your boiler or heat pump makes heat. Controls and radiators deliver it. The building determines how long it stays. Improving comfort starts by finding which part needs attention.

01Make itBoiler or heat pump

02Deliver itControls, pipes and radiators

03Keep itInsulation and heat loss

Advice grounded in your property

When Advice Becomes Assessment

Online advice can help you understand possible causes, but many heating problems need the whole system to be assessed. We look at your property, how you use it and the existing heating before recommending the next step.

Sometimes the answer is a new boiler. Sometimes it is better controls, improved balancing, upgraded radiators or simply making an existing system work properly.

What can a whole-system assessment consider?

Boiler servicing, diagnostics and repairs
Boiler replacement
Controls, TRVs and zoning
Radiators and system balancing
Power flushing where assessment identifies a need
Central-heating upgrades
Wet underfloor heating
Heat pumps and heating-system assessment

If you rent, discuss faults and proposed changes with your landlord or managing agent before arranging work.