Viessmann boiler servicing & repair

Our engineers service and repair Viessmann boilers day in, day out. We carry common Viessmann parts on the van, so most faults are fixed on the first visit, and we'll always give you an honest, fixed price before we start.

Why Callum's

No call-out fees. No nasty surprises.

We built our reputation on doing the simple things properly, turning up, being honest, and leaving your home clean.

Upfront pricing

Fixed quotes agreed before any work begins. No hidden extras, ever.

Gas Safe registered

Fully qualified, insured and Gas Safe registered engineers.

24/7 availability

Real people answer the phone around the clock for genuine emergencies.

Tidy & respectful

Dust sheets down, boots off, mess cleared. We treat your home like ours.

How it works

Getting sorted is simple

STEP 1

Give us a ring

Tell us what’s going on. We’ll give honest advice and a clear idea of cost over the phone.

STEP 2

We turn up on time

A real time slot, not a vague all-day window. We text when we’re on the way.

STEP 3

Job done right

Fixed first time wherever possible, with the price agreed before we start.

STEP 4

Guaranteed work

Every job is backed by our 12-month workmanship guarantee. Peace of mind included.

Areas covered

Viessmann servicing across London

Other brands

We service every major brand