www.heatingandventilating.net


strategy. Pulse testing, which measures leakage at 4Pa, offers an accurate view of real-world performance. Its results help to shape the fabric upgrade strategy whilst also informing ventilation system design, ultimately ensuring that the retrofit delivers the intended energy savings and occupant well-being and comfort. This performance-led approach aligns with both the 2021 Part L and Part F of the Building Regulations – and the upcoming Future Homes Standard – all further supporting the overall shift towards measured outcomes-based delivery of new


and refurbished buildings. Testing verifies that both retrofit interventions and new builds meet design intent, but also provides the evidence needed for funding bodies, auditors and residents alike.


Supporting retrofit funding and social housing bids


For local authorities and housing associations delivering against the Social Housing Decarbonisation Fund (SHDF) Wave 3 programme, airtightness testing has become a strategic advantage.


FANS & VENTILATION SYSTEMS Pre- and post-works test results not only deliver


compliance but also provide robust, verifiable data to evidence carbon and energy efficiency gains. In many cases, this level of detail strengthens bids and helps demonstrate clear alignment with national retrofit goals, including improved indoor air quality and reduced fuel poverty. In addition, the SAP score uplift offered by the testing helps to directly contribute towards landlords meeting the Minimum Energy Efficiency Standard (MEES) requirement of EPC C by 2030 across both new and existing tenancies, without unnecessary additional measures.


Performance-driven HVAC design


The combined effect of EPC reform, PAS 2035 and updated building regulations is a new era for HVAC design. Measured airtightness data informs not just compliance but system design, occupant comfort and long-term building health. Retrofit professionals are increasingly expected to demonstrate results, not assumptions. Airtightness testing, combined with ventilation flow rate tests, have the power to demonstrate that retrofit interventions and low-carbon heating installations meet both energy efficiency and occupant health requirements. In short, airtightness is no longer a tick-box


exercise: it’s a key metric shaping the future of low- carbon building performance.


FOR BOILER CONDENSATE AND PRV


PH-3.8L-HW 3.8-LITRE PRV AND CONDENSATE PUMP


PART CODE PH-3.8L-HW


PH-5L-HW FOR UNVENTED T&P


HIGH TEMPERATURE AND PRESSURE RELIEF PUMP


• Deals with boiler condensate • High pressure and pressure relief pump


8


MAX. FLOW 312 L/H TANK CAP. 3.8L


DECIBEL RATING 53 dB(A) 1.5L PUMP CYCLE 2.8pH


BOILER UP TO


6 4 2 0 150 300 450 600 CAPACITY (LPH)


MAX. FLOW 1200 L/H 20 LPM


PART CODE PH-5L-HW


3.8L LITRE TANK


This 3.8L pump has been designed to handle standard condensate and to instantly reduce the temperature of any PRV discharge. The pump is manufactured from high temperature plastic and higher specification hose. The pump has an extra large drink cycle of 1.5 litres Suitable for boiler condensate and PRV discharge for boilers upto 42kw and boiler condensate only for boilers up to 600kW.


DOWNLOAD THE HVR APP NOW 25mm INLET


PER MINUTE UP TO


32L LITRE TANK 5L


Manufactured in the UK this heavy-duty, high-temperature tank pump incorporates thermal overload protection and high-level alarm switch. Ideal for unvented cylinder T&P discharge and steam humidifiers. Having one of the largest discharge rates of 20 litres per minute, this pump can handle both high-temperature up to 100 degrees and high-flow rates.


TANK CAP. 5L


• Unvented temperature and pressure relief


• Solar cylinder temperature and pressure relief


6 8


4 2 0 500 1000 CAPACITY (LPH)


pump-house-ltd pumphousepumps


December 2025 15


@pumphouseltd @PumpHouseLtd diversitechuk


1500


sales@diversitech.com www.diversitech.global


METRES HEAD


HEATING & PLUMBING SOLUTIONS


METRES HEAD


HANDLES UP TO 110°C


HANDLES UP TO 100°C


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