References

Heating, Energy & Eco

405 sources in the library on heating, energy & eco. Each one says what the document covers and what it is good for. Name a source to see which document it is and where to read it. One at a time. Page 11 of 11.

1. supplier figure RN-L687O6

   Wholesale Heaters

   Wholesale Heaters product page for the Johnson and Starley C16D condensing warm air heater at £3,902.40 inc VAT, listing the C10D beside it at £3,373.20 inc VAT.

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2. supplier figure RN-U1GBHF

   Worcester Bosch

   Manufacturer one-page specification for the Greenstar 4000 combi. Central heating output modulates from 3 kW up to 24 kW. Hot water flow rate at the tap at 35C delta T is 10.2 l/min on the 25 kW model and 12.3 l/min on the 30 kW model, so the model number describes hot water power, not radiator power. Guarantee is up to 8 years when installed by an accredited installer. Servicing clearance is 20mm from a removable cupboard door and 600mm from a fixed surface. This is the source for the point that a 30 kW combi does not put 30 kW into the radiators.

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3. supplier figure RN-1J8I94

   Worcester Bosch

   Manufacturer professional page for the Greenstar 4000. Available at 25 kW and 30 kW outputs with hot water flow rates up to 12.3 l/min at 35C delta T. Modulates down to 3 kW central heating output, a 1:10 turndown ratio, which matters for short-cycling in a small well-insulated house. Quoted operating noise is 45 dB(A). Full flow rates are achieved from 1 bar mains pressure. Guarantee tiers of 7, 8 and 10 years are offered depending on installer accreditation and system protection.

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4. supplier figure RN-3IUFF1

   Wunda Group

   Manufacturer figures for wet underfloor heating. Water underfloor heating runs at 35-45C flow against 60-80C for a radiator circuit, which is the reason it suits a heat pump without a temperature penalty. Wunda states wet underfloor heating costs about 60 per cent less to run than electric underfloor heating and is better suited to a larger room or area. On installation effort the manufacturer states 75 m2 could be laid over a weekend by a competent installer. The 35-45C figure is the number to quote whenever a note explains why underfloor heating and heat pumps are paired.

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5. secondary RN-MZRD1R

   Checkatrade

   Checkatrade's cost guide to upgrading warm air heating: upgrading an existing system at £750 to £5,250, about £3,000 on average (last updated May 2024).

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