Technical Engineer

RES Limited; Milton Keynes; On-site; GBP 42,000 - 65,000; Full time

Benefits offered by this job

Company car

Annual leave

Pension scheme (matched)

Bonuses

Healthcare

Cycle to Work

Job summary

RES Limited in East England is seeking a Technical Sales Engineer who will conduct technical site surveys, design heat pump solutions, and deliver on-site quotations.

You will liaise with installers and homeowners, ensure MCS compliance, and provide remote technical support while travelling within the region.

This field-based role offers a competitive salary, a company car, and a broad benefits package.

Qualifications

• Experience conducting technical site surveys and producing on-site quotations.
• Ability to produce heat loss calculations and system designs.
• MCS standards and Building Regulations knowledge.
• Consultative mindset to translate data for non-technical customers.

Responsibilities

• Conduct technical site surveys, agree specifications, produce on-site quotations, commission heat pump systems, and handover.
• Prepare room-by-room heat loss calculations, designs and performance assessments; compile technical proposals and quotations; maintain CRM records.
• Act as Nominated Technical Supervisor for regional MCS projects ensuring compliance with standards.
• Provide phone-based and remote technical support; maintain relationships with installers.

Skills

Low-temperature hydraulic design

Electrical fault-finding

Consultative communication

Willingness to travel

Education

Plumbing & Heating Level 3 NVQ or equivalent

Heat Pump Design & Installation (LCL/BPEC)

G3 Unvented Hot Water, WRAS, MCS knowledge

Tools

CRM systems

Job description

Technical Sales Engineer - Field Based - RES - Renewables - East England

Responsibilities

• Conducting technical site surveys, agreeing system specifications with installers and homeowners, producing on-site quotations, commissioning Air Source Heat Pump systems, completing system handovers, and resolving technical issues through remedial visits.


• Produce room‑by‑room heat loss calculations, system designs and performance assessments using company design tools and established processes, with full training and technical support provided. Compile technical proposals and quotations for the sales team, ensuring accurate project records are maintained within the CRM system.


• Acting as the Nominated Technical Supervisor for all regional MCS projects, ensuring every subcontracted installation adheres to MCS standards and Building Regulations.


• Providing phone‑based and remote technical support, maintaining strong working relationships with assigned installers, and acting as a consistent technical point of contact.

Qualifications

• Plumbing & Heating: Level 3 NVQ or equivalent.


• Heat Pumps: LCL/BPEC Heat Pump Design & Installation.


• Compliance: G3 Unvented Hot Water, WRAS, and a comprehensive knowledge of MCS standards.


• Technical Expertise: Proven experience in low-temperature hydraulic design and electrical fault‑finding.


• Soft Skills: A \"consultative\" mindset with the ability to translate technical data into actionable insights for non‑technical customers.


• Logistics: Based in/around East London or Ipswich, with a willingness to travel and occasional overnight stays.

Salary and Benefits

Competitive Salary + Company Car + Excellent Benefits

Benefits

• Annual leave (increasing with length of service)


• generous pension scheme (matched up to 9%)


• potential to earn bonuses


• enhanced maternity / adoption leave and access to a great range of online and high street discounts


• free access to healthcare


• our popular YuLife app


• our Cycle to Work scheme and more!

Employment Details

• This is a full-time, permanent, field based role working 42.5 hours per week Monday to Friday between 8am - 5pm.

About the Company

We are RES, a part of the Wolseley Group - a leading specialist trade merchant across the UK and Ireland. We pride ourselves in putting our people and customers at the heart of everything we do - and best of all, provide opportunities to develop skills and build careers through our award-winning Wolseley Talent Guild.