What Happens After Your Boiler Is Installed?

Getting a new boiler fitted is a big job, and for most people, it’s not something you do very often. Once the engineer leaves and the heating’s back on, many homeowners think that’s the end of it. In reality, what happens after your boiler is installed matters just as much as the installation itself.

What should happen on the day your boiler is installed?

A proper boiler installation doesn’t just stop once the boiler is on the wall and firing up. Before the engineer leaves, a few important things should happen.

The boiler should be fully checked and tested

Your engineer should:

• Make sure the boiler fires up properly

• Check heating and hot water both work

• Test safety features

• Check for leaks

• Set the boiler pressure correctly

This process is called commissioning. You don’t need to remember the technical term — just know that it means the boiler has been properly checked and signed off.

You should be shown how things work

A good installer won’t just leave you guessing. They should explain:

• How to use your thermostat and timer

• What pressure the boiler should be at

• What to do if pressure drops

• What warning signs to look out for

If anything doesn’t make sense, ask. There are no silly questions — it’s your boiler.

The first few weeks after installation

It’s common for small adjustments to be needed after a new boiler goes in. That doesn’t mean anything’s wrong.

Radiators may need balancing

If some radiators heat up faster than others, the system might need balancing. This is normal after a boiler change and can be sorted by an engineer.

Keep an eye on pressure

Most boilers work best when the pressure sits around a set range (often 1–1.5 bar when cold).

If pressure keeps dropping:

• Don’t ignore it

• Don’t keep topping it up endlessly

• Call an engineer

Pressure problems often point to small issues that are easier (and cheaper) to fix early.

Why boiler servicing matters

A lot of people ask:

“Do I really need to service my boiler every year?”

The short answer is: yes.

What a service actually does

A proper boiler service:

• Checks the boiler is burning gas safely

• Looks for early signs of wear

• Cleans parts that affect efficiency

• Reduces the chance of breakdowns

• Helps keep your warranty valid

It’s not about selling repairs — it’s about catching problems early.

When to book a service

The best time is spring or summer.

Why?

• Engineers are less busy

• You’re not stuck without heating in winter

• Problems can be fixed before cold weather

Leaving servicing until winter often means longer waits and higher stress.

Aftercare – what does that really mean?

Aftercare simply means ongoing support after installation.

At ANW Plumbing & Heating, aftercare focuses on helping customers keep their systems working properly long-term — not just fitting and forgetting.

Aftercare can include:

• Annual servicing reminders

• Ongoing maintenance support

• Advice if something doesn’t feel right

• Help during busy winter periods

Some people prefer pay-as-you-go servicing. Others like a service plan for peace of mind. Either option is fine — the important thing is not ignoring maintenance altogether.

Simple things you can do at home

You don’t need to be an engineer to look after your boiler properly.

Keep the area around the boiler clear

Don’t block vents or pack items tightly around it. Boilers need airflow and access for safety checks.

Bleed radiators when needed

If a radiator is cold at the top, bleeding it can help. Always check boiler pressure afterwards.

Use your heating controls properly

Short bursts of extreme heat cost more and strain the system. Steady, sensible settings work better for most homes.

Pay attention to warning signs

Call an engineer if you notice:

• Strange noises

• Water leaks

• Error codes

• Pressure problems

• Heating or hot water cutting out

Ignoring these usually makes things worse.

If you’re a landlord – extra responsibility

If the boiler is in a rented property, aftercare isn’t optional.

Landlords must:

• Arrange regular gas safety checks

• Keep records

• Ensure the boiler is safe at all times

Even a brand-new boiler still needs managing properly. Missing paperwork or skipped servicing can cause serious problems later.

A simple after-installation checklist

Right after installation

• Boiler tested and explained

• Paperwork provided

• Warranty registered

• Controls explained

In the first month

• Check radiator heat is even

• Keep paperwork safe

• Book your first service reminder

Ongoing

• Annual servicing

• Watch pressure and performance

• Call early if something feels off

FAQs

1. Do I really need to service my boiler every year?
Yes. Yearly servicing helps keep your boiler safe, reliable, and usually keeps the manufacturer’s warranty valid.

2. What happens if I don’t service my boiler?
Small problems can turn into breakdowns, and many boiler warranties become invalid without annual servicing.

3. How long should a new boiler last?
Most modern boilers last around 10–15 years with proper servicing and regular maintenance.

4. Is it normal for boiler pressure to drop?
A small drop can happen, but regular pressure loss usually means there’s a fault that needs checking.

5. When is the best time to book a boiler service?
Spring or summer is best, as engineers are less busy and problems can be fixed before winter.

6. What should I do if my boiler makes strange noises?
Unusual noises aren’t normal. It’s best to call a qualified engineer before the issue gets worse.

7. Does a new boiler still need a Gas Safety Check?
Yes. Even new boilers must be checked regularly to ensure they’re running safely.

8. Can I look after my boiler myself?
You can keep the area clear and monitor pressure, but any gas work must be done by a Gas Safe engineer.

9. Do landlords have extra responsibilities after installation?
Yes. Landlords must arrange regular gas safety checks and keep proper records for tenants.

Summary