What happens after I’ve purchased my boiler online?

Once you place your order online, most in-stock boilers can be fitted as quickly as the next day. Our team will contact you to confirm a convenient installation time and ensure everything is ready for a smooth, hassle-free fit.

Do your installations include warranties?

Yes. Every new installation comes with up to 10 years manufacturer’s parts warranty plus our own one-year labour guarantee for added protection.

Can you service systems you didn’t originally install?

Absolutely. Our engineers are trained on all major brands and models, so we can troubleshoot, repair, or upgrade any existing system.

Do your prices include VAT?

Yes, all of our prices are inclusive of VAT.

How much does a new boiler cost?

Our boilers start from £1,649 including free fitting. The final price depends on the boiler type, size, and your home’s heating needs.

Do you offer finance or payment plans?

Yes, we provide flexible payment options to help spread the cost of your new boiler.

What type of boiler do I need for my home?

It depends on your property size, number of bathrooms, and amount of radiators. If you need help choosing the right combi, system, or regular boiler, we can guide you.

How long does a boiler installation take?

Most boiler fittings are completed within 4–6 hours. More complex jobs may take longer, but we’ll always let you know in advance.

Do you remove my old boiler?

Yes. We safely disconnect and remove your old boiler as part of the installation at no extra cost.

Are your engineers Gas Safe registered?

Absolutely. Every engineer we send is fully qualified and Gas Safe registered for your safety and peace of mind.

Do you offer boiler servicing and maintenance?

Yes, we provide annual servicing and optional service plans to keep your boiler running efficiently.

What brands of boilers do you install?

We install leading brands known for reliability and efficiency, including Worcester Bosch, Vaillant, Ideal, and more.

Will a new boiler help reduce my energy bills?

Yes. Modern boilers are far more efficient and can significantly lower your heating costs.

Do you install smart thermostats?

Yes, we can fit smart thermostats like Hive or Nest during your boiler installation.

What areas do you cover?

We cover a wide service area from London to Liverpool, including surrounding towns and regions.

Do I need to be home during the installation?

Yes, someone over 18 must be present to give access and approve the final handover.

Can you replace my boiler in the same location?

In most cases, yes. If a relocation is needed, we’ll advise you during your virtual survey.

What warranty comes with my new boiler?

All boilers come with a manufacturer warranty, typically ranging from 5 to 12 years depending on the model.

Do you install boilers in flats and apartments?

Yes, we install boilers in all property types, including flats, maisonettes, and rental properties.

Can you upgrade my heating system at the same time?

Yes, we can upgrade radiators, pipework, and controls during your installation if required.

What should I do if my boiler breaks down?

If your boiler stops working, contact us and we’ll arrange a repair or replacement as quickly as possible.

Do you offer emergency boiler installation?

Yes, we provide rapid response and next-day fitting for urgent boiler replacements.

How do I get a quote for a new boiler?

You can get an instant online quote by answering a few quick questions about your home and heating system.

Can you install a boiler without visiting my home?

Yes. Most installations can be quoted online using simple questions about your current system. A home visit is only needed for unusual setups.

Do you offer landlord safety certificates?

Yes, we provide Gas Safety Certificates (CP12) for landlords, including annual boiler checks and servicing.

What is the difference between a combi, system, and regular boiler?

A combi provides instant hot water, a system boiler uses a cylinder, and a regular boiler works with older heating setups.

Will my water pressure improve with a new boiler?

In many cases, yes. Modern combi boilers can improve flow rates, especially if your current boiler is outdated.

Do you install boilers in rental properties?

Yes, we work with landlords, letting agents, and property managers to install and maintain boilers in rented homes.

Can you move my boiler to a different room?

Yes, we can relocate your boiler if needed. We’ll explain any extra work involved, such as pipe rerouting or flue changes.

How often should a boiler be serviced?

Your boiler should be serviced once a year to keep it safe, efficient, and under warranty.

What signs show I need a new boiler?

Common signs include rising energy bills, frequent breakdowns, strange noises, or your boiler being over 10–15 years old.

Do you offer warranties on installation work?

Yes, all our installations come with workmanship guarantees in addition to the manufacturer warranty.

Can a new boiler reduce carbon emissions?

Yes. Modern A-rated boilers are far more efficient and can significantly reduce your home’s carbon footprint.

Do you install boilers in commercial properties?

We currently only install and replace boilers for homeowners and landlords in residential properties.

What should I do to prepare for my boiler installation?

Clear the area around your boiler and ensure easy access. Our engineers handle everything else.

Will my heating be off during installation?

Yes, your heating and hot water will be off during the fitting, but we aim to complete the job the same day.

Do you offer emergency boiler repairs?

Yes, we provide fast response for breakdowns and can arrange repairs or replacement depending on the issue.

How long will my new boiler last?

A modern boiler typically lasts 10–15 years with regular servicing and proper maintenance.

How to Select the Right Size Boiler for Your Home

27 Apr

Written By JML Heating Ltd

Choosing the correct boiler size is one of the most important decisions when replacing your boiler. An undersized boiler will struggle to heat your home, while an oversized one wastes energy and money.

Start With Your Property Type

Your home’s size and layout influence heat loss and therefore boiler output. Flats lose less heat than houses, while detached homes lose the most.

Flats: Typically need less kW due to shared walls.
Terraced houses: Moderate heat loss.
Semi‑detached: Slightly higher heat demand.
Detached homes: Highest heat loss, often requiring a larger boiler.

Property type adjustments are commonly used in boiler sizing, with flats often needing around 15% less output, and detached homes needing up to 15% more.

Count Your Radiators

Radiators are the biggest indicator of heating demand.

Industry guidance suggests ~1.5 kW per radiator for system/heat‑only boilers.

Example:

8 radiators → ~12 kW heating load
12 radiators → ~18 kW heating load
15 radiators → ~22.5 kW heating load

This helps determine the correct boiler size for heating (system / regular boilers).

Count Your Bathrooms

Bathrooms matter most when choosing a combi boiler, because combis heat hot water instantly.

Typical combi boiler guidance:

1 bathroom: 24–28 kW - heats up to 10 radiators
2 bathrooms: 28–34 kW - heats up to 15 radiators
3+ bathrooms: 34–42 kW - heats up to 20 radiators (or consider a system boiler instead)

Combis must be sized for hot‑water flow rate, not just heating.

Choosing Between Combi vs System / Heat Only

Combi Boilers

Best for: flats, small–medium homes, 1–2 bathrooms. Sizing is driven by hot water demand, not just radiators.

1 bathroom → 24–28 kW
2 bathrooms → 28–34 kW
3+ bathrooms → 35–42 kW+

System / Heat Only Boilers

Best for: larger homes, multiple bathrooms, low mains pressure. Sizing is based on radiators + cylinder demand, not instantaneous hot water. Typical ranges:

Small homes: 15–24 kW
Medium homes: 18–30 kW
Large homes: 30–40 kW (depending on radiator count)